diff --git a/modules/eks-managed-node-group/README.md b/modules/eks-managed-node-group/README.md
index 179090fecd..4ec3c782c9 100644
--- a/modules/eks-managed-node-group/README.md
+++ b/modules/eks-managed-node-group/README.md
@@ -91,7 +91,7 @@ module "eks_managed_node_group" {
 | <a name="input_ami_type"></a> [ami\_type](#input\_ami\_type) | Type of Amazon Machine Image (AMI) associated with the EKS Node Group. Valid values are `AL2_x86_64`, `AL2_x86_64_GPU`, `AL2_ARM_64`, `CUSTOM`, `BOTTLEROCKET_ARM_64`, `BOTTLEROCKET_x86_64` | `string` | `null` | no |
 | <a name="input_block_device_mappings"></a> [block\_device\_mappings](#input\_block\_device\_mappings) | Specify volumes to attach to the instance besides the volumes specified by the AMI | `any` | `{}` | no |
 | <a name="input_bootstrap_extra_args"></a> [bootstrap\_extra\_args](#input\_bootstrap\_extra\_args) | Additional arguments passed to the bootstrap script. When `platform` = `bottlerocket`; these are additional [settings](https://github.com/bottlerocket-os/bottlerocket#settings) that are provided to the Bottlerocket user data | `string` | `""` | no |
-| <a name="input_capacity_reservation_specification"></a> [capacity\_reservation\_specification](#input\_capacity\_reservation\_specification) | Targeting for EC2 capacity reservations | `any` | `null` | no |
+| <a name="input_capacity_reservation_specification"></a> [capacity\_reservation\_specification](#input\_capacity\_reservation\_specification) | Targeting for EC2 capacity reservations | `any` | `{}` | no |
 | <a name="input_capacity_type"></a> [capacity\_type](#input\_capacity\_type) | Type of capacity associated with the EKS Node Group. Valid values: `ON_DEMAND`, `SPOT` | `string` | `"ON_DEMAND"` | no |
 | <a name="input_cluster_auth_base64"></a> [cluster\_auth\_base64](#input\_cluster\_auth\_base64) | Base64 encoded CA of associated EKS cluster | `string` | `""` | no |
 | <a name="input_cluster_endpoint"></a> [cluster\_endpoint](#input\_cluster\_endpoint) | Endpoint of associated EKS cluster | `string` | `""` | no |
@@ -101,21 +101,21 @@ module "eks_managed_node_group" {
 | <a name="input_cluster_security_group_id"></a> [cluster\_security\_group\_id](#input\_cluster\_security\_group\_id) | Cluster control plane security group ID | `string` | `null` | no |
 | <a name="input_cluster_service_ipv4_cidr"></a> [cluster\_service\_ipv4\_cidr](#input\_cluster\_service\_ipv4\_cidr) | The CIDR block to assign Kubernetes service IP addresses from. If you don't specify a block, Kubernetes assigns addresses from either the 10.100.0.0/16 or 172.20.0.0/16 CIDR blocks | `string` | `null` | no |
 | <a name="input_cluster_version"></a> [cluster\_version](#input\_cluster\_version) | Kubernetes version. Defaults to EKS Cluster Kubernetes version | `string` | `null` | no |
-| <a name="input_cpu_options"></a> [cpu\_options](#input\_cpu\_options) | The CPU options for the instance | `map(string)` | `null` | no |
+| <a name="input_cpu_options"></a> [cpu\_options](#input\_cpu\_options) | The CPU options for the instance | `map(string)` | `{}` | no |
 | <a name="input_create"></a> [create](#input\_create) | Determines whether to create EKS managed node group or not | `bool` | `true` | no |
 | <a name="input_create_iam_role"></a> [create\_iam\_role](#input\_create\_iam\_role) | Determines whether an IAM role is created or to use an existing IAM role | `bool` | `true` | no |
 | <a name="input_create_launch_template"></a> [create\_launch\_template](#input\_create\_launch\_template) | Determines whether to create a launch template or not. If set to `false`, EKS will use its own default launch template | `bool` | `true` | no |
 | <a name="input_create_security_group"></a> [create\_security\_group](#input\_create\_security\_group) | Determines whether to create a security group | `bool` | `true` | no |
-| <a name="input_credit_specification"></a> [credit\_specification](#input\_credit\_specification) | Customize the credit specification of the instance | `map(string)` | `null` | no |
+| <a name="input_credit_specification"></a> [credit\_specification](#input\_credit\_specification) | Customize the credit specification of the instance | `map(string)` | `{}` | no |
 | <a name="input_desired_size"></a> [desired\_size](#input\_desired\_size) | Desired number of instances/nodes | `number` | `1` | no |
 | <a name="input_disable_api_termination"></a> [disable\_api\_termination](#input\_disable\_api\_termination) | If true, enables EC2 instance termination protection | `bool` | `null` | no |
 | <a name="input_disk_size"></a> [disk\_size](#input\_disk\_size) | Disk size in GiB for nodes. Defaults to `20` | `number` | `null` | no |
 | <a name="input_ebs_optimized"></a> [ebs\_optimized](#input\_ebs\_optimized) | If true, the launched EC2 instance(s) will be EBS-optimized | `bool` | `null` | no |
-| <a name="input_elastic_gpu_specifications"></a> [elastic\_gpu\_specifications](#input\_elastic\_gpu\_specifications) | The elastic GPU to attach to the instance | `map(string)` | `null` | no |
-| <a name="input_elastic_inference_accelerator"></a> [elastic\_inference\_accelerator](#input\_elastic\_inference\_accelerator) | Configuration block containing an Elastic Inference Accelerator to attach to the instance | `map(string)` | `null` | no |
+| <a name="input_elastic_gpu_specifications"></a> [elastic\_gpu\_specifications](#input\_elastic\_gpu\_specifications) | The elastic GPU to attach to the instance | `map(string)` | `{}` | no |
+| <a name="input_elastic_inference_accelerator"></a> [elastic\_inference\_accelerator](#input\_elastic\_inference\_accelerator) | Configuration block containing an Elastic Inference Accelerator to attach to the instance | `map(string)` | `{}` | no |
 | <a name="input_enable_bootstrap_user_data"></a> [enable\_bootstrap\_user\_data](#input\_enable\_bootstrap\_user\_data) | Determines whether the bootstrap configurations are populated within the user data template | `bool` | `false` | no |
 | <a name="input_enable_monitoring"></a> [enable\_monitoring](#input\_enable\_monitoring) | Enables/disables detailed monitoring | `bool` | `true` | no |
-| <a name="input_enclave_options"></a> [enclave\_options](#input\_enclave\_options) | Enable Nitro Enclaves on launched instances | `map(string)` | `null` | no |
+| <a name="input_enclave_options"></a> [enclave\_options](#input\_enclave\_options) | Enable Nitro Enclaves on launched instances | `map(string)` | `{}` | no |
 | <a name="input_force_update_version"></a> [force\_update\_version](#input\_force\_update\_version) | Force version update if existing pods are unable to be drained due to a pod disruption budget issue | `bool` | `null` | no |
 | <a name="input_iam_role_additional_policies"></a> [iam\_role\_additional\_policies](#input\_iam\_role\_additional\_policies) | Additional policies to be added to the IAM role | `list(string)` | `[]` | no |
 | <a name="input_iam_role_arn"></a> [iam\_role\_arn](#input\_iam\_role\_arn) | Existing IAM role ARN for the node group. Required if `create_iam_role` is set to `false` | `string` | `null` | no |
@@ -126,7 +126,7 @@ module "eks_managed_node_group" {
 | <a name="input_iam_role_permissions_boundary"></a> [iam\_role\_permissions\_boundary](#input\_iam\_role\_permissions\_boundary) | ARN of the policy that is used to set the permissions boundary for the IAM role | `string` | `null` | no |
 | <a name="input_iam_role_tags"></a> [iam\_role\_tags](#input\_iam\_role\_tags) | A map of additional tags to add to the IAM role created | `map(string)` | `{}` | no |
 | <a name="input_iam_role_use_name_prefix"></a> [iam\_role\_use\_name\_prefix](#input\_iam\_role\_use\_name\_prefix) | Determines whether the IAM role name (`iam_role_name`) is used as a prefix | `bool` | `true` | no |
-| <a name="input_instance_market_options"></a> [instance\_market\_options](#input\_instance\_market\_options) | The market (purchasing) option for the instance | `any` | `null` | no |
+| <a name="input_instance_market_options"></a> [instance\_market\_options](#input\_instance\_market\_options) | The market (purchasing) option for the instance | `any` | `{}` | no |
 | <a name="input_instance_types"></a> [instance\_types](#input\_instance\_types) | Set of instance types associated with the EKS Node Group. Defaults to `["t3.medium"]` | `list(string)` | `null` | no |
 | <a name="input_kernel_id"></a> [kernel\_id](#input\_kernel\_id) | The kernel ID | `string` | `null` | no |
 | <a name="input_key_name"></a> [key\_name](#input\_key\_name) | The key name that should be used for the instance(s) | `string` | `null` | no |
@@ -137,13 +137,13 @@ module "eks_managed_node_group" {
 | <a name="input_launch_template_tags"></a> [launch\_template\_tags](#input\_launch\_template\_tags) | A map of additional tags to add to the tag\_specifications of launch template created | `map(string)` | `{}` | no |
 | <a name="input_launch_template_use_name_prefix"></a> [launch\_template\_use\_name\_prefix](#input\_launch\_template\_use\_name\_prefix) | Determines whether to use `launch_template_name` as is or create a unique name beginning with the `launch_template_name` as the prefix | `bool` | `true` | no |
 | <a name="input_launch_template_version"></a> [launch\_template\_version](#input\_launch\_template\_version) | Launch template version number. The default is `$Default` | `string` | `null` | no |
-| <a name="input_license_specifications"></a> [license\_specifications](#input\_license\_specifications) | A list of license specifications to associate with | `map(string)` | `null` | no |
+| <a name="input_license_specifications"></a> [license\_specifications](#input\_license\_specifications) | A list of license specifications to associate with | `map(string)` | `{}` | no |
 | <a name="input_max_size"></a> [max\_size](#input\_max\_size) | Maximum number of instances/nodes | `number` | `3` | no |
 | <a name="input_metadata_options"></a> [metadata\_options](#input\_metadata\_options) | Customize the metadata options for the instance | `map(string)` | <pre>{<br>  "http_endpoint": "enabled",<br>  "http_put_response_hop_limit": 2,<br>  "http_tokens": "required"<br>}</pre> | no |
 | <a name="input_min_size"></a> [min\_size](#input\_min\_size) | Minimum number of instances/nodes | `number` | `0` | no |
 | <a name="input_name"></a> [name](#input\_name) | Name of the EKS managed node group | `string` | `""` | no |
 | <a name="input_network_interfaces"></a> [network\_interfaces](#input\_network\_interfaces) | Customize network interfaces to be attached at instance boot time | `list(any)` | `[]` | no |
-| <a name="input_placement"></a> [placement](#input\_placement) | The placement of the instance | `map(string)` | `null` | no |
+| <a name="input_placement"></a> [placement](#input\_placement) | The placement of the instance | `map(string)` | `{}` | no |
 | <a name="input_platform"></a> [platform](#input\_platform) | Identifies if the OS platform is `bottlerocket` or `linux` based; `windows` is not supported | `string` | `"linux"` | no |
 | <a name="input_post_bootstrap_user_data"></a> [post\_bootstrap\_user\_data](#input\_post\_bootstrap\_user\_data) | User data that is appended to the user data script after of the EKS bootstrap script. Not used when `platform` = `bottlerocket` | `string` | `""` | no |
 | <a name="input_pre_bootstrap_user_data"></a> [pre\_bootstrap\_user\_data](#input\_pre\_bootstrap\_user\_data) | User data that is injected into the user data script ahead of the EKS bootstrap script. Not used when `platform` = `bottlerocket` | `string` | `""` | no |
diff --git a/modules/eks-managed-node-group/main.tf b/modules/eks-managed-node-group/main.tf
index b18335de20..f55630876e 100644
--- a/modules/eks-managed-node-group/main.tf
+++ b/modules/eks-managed-node-group/main.tf
@@ -91,7 +91,7 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "capacity_reservation_specification" {
-    for_each = var.capacity_reservation_specification != null ? [var.capacity_reservation_specification] : []
+    for_each = length(var.capacity_reservation_specification) > 0 ? [var.capacity_reservation_specification] : []
     content {
       capacity_reservation_preference = lookup(capacity_reservation_specification.value, "capacity_reservation_preference", null)
 
@@ -105,7 +105,7 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "cpu_options" {
-    for_each = var.cpu_options != null ? [var.cpu_options] : []
+    for_each = length(var.cpu_options) > 0 ? [var.cpu_options] : []
     content {
       core_count       = cpu_options.value.core_count
       threads_per_core = cpu_options.value.threads_per_core
@@ -113,28 +113,28 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "credit_specification" {
-    for_each = var.credit_specification != null ? [var.credit_specification] : []
+    for_each = length(var.credit_specification) > 0 ? [var.credit_specification] : []
     content {
       cpu_credits = credit_specification.value.cpu_credits
     }
   }
 
   dynamic "elastic_gpu_specifications" {
-    for_each = var.elastic_gpu_specifications != null ? [var.elastic_gpu_specifications] : []
+    for_each = length(var.elastic_gpu_specifications) > 0 ? [var.elastic_gpu_specifications] : []
     content {
       type = elastic_gpu_specifications.value.type
     }
   }
 
   dynamic "elastic_inference_accelerator" {
-    for_each = var.elastic_inference_accelerator != null ? [var.elastic_inference_accelerator] : []
+    for_each = length(var.elastic_inference_accelerator) > 0 ? [var.elastic_inference_accelerator] : []
     content {
       type = elastic_inference_accelerator.value.type
     }
   }
 
   dynamic "enclave_options" {
-    for_each = var.enclave_options != null ? [var.enclave_options] : []
+    for_each = length(var.enclave_options) > 0 ? [var.enclave_options] : []
     content {
       enabled = enclave_options.value.enabled
     }
@@ -160,12 +160,12 @@ resource "aws_launch_template" "this" {
   # }
 
   dynamic "instance_market_options" {
-    for_each = var.instance_market_options != null ? [var.instance_market_options] : []
+    for_each = length(var.instance_market_options) > 0 ? [var.instance_market_options] : []
     content {
       market_type = instance_market_options.value.market_type
 
       dynamic "spot_options" {
-        for_each = lookup(instance_market_options.value, "spot_options", null) != null ? [instance_market_options.value.spot_options] : []
+        for_each = length(lookup(instance_market_options.value, "spot_options", {})) > 0 ? [instance_market_options.value.spot_options] : []
         content {
           block_duration_minutes         = lookup(spot_options.value, "block_duration_minutes", null)
           instance_interruption_behavior = lookup(spot_options.value, "instance_interruption_behavior", null)
@@ -178,14 +178,14 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "license_specification" {
-    for_each = var.license_specifications != null ? [var.license_specifications] : []
+    for_each = length(var.license_specifications) > 0 ? [var.license_specifications] : []
     content {
       license_configuration_arn = license_specifications.value.license_configuration_arn
     }
   }
 
   dynamic "metadata_options" {
-    for_each = var.metadata_options != null ? [var.metadata_options] : []
+    for_each = length(var.metadata_options) > 0 ? [var.metadata_options] : []
     content {
       http_endpoint               = lookup(metadata_options.value, "http_endpoint", null)
       http_tokens                 = lookup(metadata_options.value, "http_tokens", null)
@@ -225,7 +225,7 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "placement" {
-    for_each = var.placement != null ? [var.placement] : []
+    for_each = length(var.placement) > 0 ? [var.placement] : []
     content {
       affinity          = lookup(placement.value, "affinity", null)
       availability_zone = lookup(placement.value, "availability_zone", null)
diff --git a/modules/eks-managed-node-group/variables.tf b/modules/eks-managed-node-group/variables.tf
index 5929817887..2398fb1d7a 100644
--- a/modules/eks-managed-node-group/variables.tf
+++ b/modules/eks-managed-node-group/variables.tf
@@ -171,49 +171,49 @@ variable "block_device_mappings" {
 variable "capacity_reservation_specification" {
   description = "Targeting for EC2 capacity reservations"
   type        = any
-  default     = null
+  default     = {}
 }
 
 variable "cpu_options" {
   description = "The CPU options for the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "credit_specification" {
   description = "Customize the credit specification of the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "elastic_gpu_specifications" {
   description = "The elastic GPU to attach to the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "elastic_inference_accelerator" {
   description = "Configuration block containing an Elastic Inference Accelerator to attach to the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "enclave_options" {
   description = "Enable Nitro Enclaves on launched instances"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "instance_market_options" {
   description = "The market (purchasing) option for the instance"
   type        = any
-  default     = null
+  default     = {}
 }
 
 variable "license_specifications" {
   description = "A list of license specifications to associate with"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "metadata_options" {
@@ -241,7 +241,7 @@ variable "network_interfaces" {
 variable "placement" {
   description = "The placement of the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "launch_template_tags" {
diff --git a/modules/self-managed-node-group/README.md b/modules/self-managed-node-group/README.md
index 3cba48859d..43b5eb4ba6 100644
--- a/modules/self-managed-node-group/README.md
+++ b/modules/self-managed-node-group/README.md
@@ -82,7 +82,7 @@ module "self_managed_node_group" {
 | <a name="input_block_device_mappings"></a> [block\_device\_mappings](#input\_block\_device\_mappings) | Specify volumes to attach to the instance besides the volumes specified by the AMI | `any` | `{}` | no |
 | <a name="input_bootstrap_extra_args"></a> [bootstrap\_extra\_args](#input\_bootstrap\_extra\_args) | Additional arguments passed to the bootstrap script. When `platform` = `bottlerocket`; these are additional [settings](https://github.com/bottlerocket-os/bottlerocket#settings) that are provided to the Bottlerocket user data | `string` | `""` | no |
 | <a name="input_capacity_rebalance"></a> [capacity\_rebalance](#input\_capacity\_rebalance) | Indicates whether capacity rebalance is enabled | `bool` | `null` | no |
-| <a name="input_capacity_reservation_specification"></a> [capacity\_reservation\_specification](#input\_capacity\_reservation\_specification) | Targeting for EC2 capacity reservations | `any` | `null` | no |
+| <a name="input_capacity_reservation_specification"></a> [capacity\_reservation\_specification](#input\_capacity\_reservation\_specification) | Targeting for EC2 capacity reservations | `any` | `{}` | no |
 | <a name="input_cluster_auth_base64"></a> [cluster\_auth\_base64](#input\_cluster\_auth\_base64) | Base64 encoded CA of associated EKS cluster | `string` | `""` | no |
 | <a name="input_cluster_endpoint"></a> [cluster\_endpoint](#input\_cluster\_endpoint) | Endpoint of associated EKS cluster | `string` | `""` | no |
 | <a name="input_cluster_ip_family"></a> [cluster\_ip\_family](#input\_cluster\_ip\_family) | The IP family used to assign Kubernetes pod and service addresses. Valid values are `ipv4` (default) and `ipv6` | `string` | `null` | no |
@@ -90,28 +90,28 @@ module "self_managed_node_group" {
 | <a name="input_cluster_primary_security_group_id"></a> [cluster\_primary\_security\_group\_id](#input\_cluster\_primary\_security\_group\_id) | The ID of the EKS cluster primary security group to associate with the instance(s). This is the security group that is automatically created by the EKS service | `string` | `null` | no |
 | <a name="input_cluster_security_group_id"></a> [cluster\_security\_group\_id](#input\_cluster\_security\_group\_id) | Cluster control plane security group ID | `string` | `null` | no |
 | <a name="input_cluster_version"></a> [cluster\_version](#input\_cluster\_version) | Kubernetes cluster version - used to lookup default AMI ID if one is not provided | `string` | `null` | no |
-| <a name="input_cpu_options"></a> [cpu\_options](#input\_cpu\_options) | The CPU options for the instance | `map(string)` | `null` | no |
+| <a name="input_cpu_options"></a> [cpu\_options](#input\_cpu\_options) | The CPU options for the instance | `map(string)` | `{}` | no |
 | <a name="input_create"></a> [create](#input\_create) | Determines whether to create self managed node group or not | `bool` | `true` | no |
 | <a name="input_create_autoscaling_group"></a> [create\_autoscaling\_group](#input\_create\_autoscaling\_group) | Determines whether to create autoscaling group or not | `bool` | `true` | no |
 | <a name="input_create_iam_instance_profile"></a> [create\_iam\_instance\_profile](#input\_create\_iam\_instance\_profile) | Determines whether an IAM instance profile is created or to use an existing IAM instance profile | `bool` | `true` | no |
 | <a name="input_create_launch_template"></a> [create\_launch\_template](#input\_create\_launch\_template) | Determines whether to create launch template or not | `bool` | `true` | no |
 | <a name="input_create_schedule"></a> [create\_schedule](#input\_create\_schedule) | Determines whether to create autoscaling group schedule or not | `bool` | `true` | no |
 | <a name="input_create_security_group"></a> [create\_security\_group](#input\_create\_security\_group) | Determines whether to create a security group | `bool` | `true` | no |
-| <a name="input_credit_specification"></a> [credit\_specification](#input\_credit\_specification) | Customize the credit specification of the instance | `map(string)` | `null` | no |
+| <a name="input_credit_specification"></a> [credit\_specification](#input\_credit\_specification) | Customize the credit specification of the instance | `map(string)` | `{}` | no |
 | <a name="input_default_cooldown"></a> [default\_cooldown](#input\_default\_cooldown) | The amount of time, in seconds, after a scaling activity completes before another scaling activity can start | `number` | `null` | no |
 | <a name="input_delete_timeout"></a> [delete\_timeout](#input\_delete\_timeout) | Delete timeout to wait for destroying autoscaling group | `string` | `null` | no |
 | <a name="input_desired_size"></a> [desired\_size](#input\_desired\_size) | The number of Amazon EC2 instances that should be running in the autoscaling group | `number` | `1` | no |
 | <a name="input_disable_api_termination"></a> [disable\_api\_termination](#input\_disable\_api\_termination) | If true, enables EC2 instance termination protection | `bool` | `null` | no |
 | <a name="input_ebs_optimized"></a> [ebs\_optimized](#input\_ebs\_optimized) | If true, the launched EC2 instance will be EBS-optimized | `bool` | `null` | no |
-| <a name="input_elastic_gpu_specifications"></a> [elastic\_gpu\_specifications](#input\_elastic\_gpu\_specifications) | The elastic GPU to attach to the instance | `map(string)` | `null` | no |
-| <a name="input_elastic_inference_accelerator"></a> [elastic\_inference\_accelerator](#input\_elastic\_inference\_accelerator) | Configuration block containing an Elastic Inference Accelerator to attach to the instance | `map(string)` | `null` | no |
+| <a name="input_elastic_gpu_specifications"></a> [elastic\_gpu\_specifications](#input\_elastic\_gpu\_specifications) | The elastic GPU to attach to the instance | `map(string)` | `{}` | no |
+| <a name="input_elastic_inference_accelerator"></a> [elastic\_inference\_accelerator](#input\_elastic\_inference\_accelerator) | Configuration block containing an Elastic Inference Accelerator to attach to the instance | `map(string)` | `{}` | no |
 | <a name="input_enable_monitoring"></a> [enable\_monitoring](#input\_enable\_monitoring) | Enables/disables detailed monitoring | `bool` | `true` | no |
-| <a name="input_enabled_metrics"></a> [enabled\_metrics](#input\_enabled\_metrics) | A list of metrics to collect. The allowed values are `GroupDesiredCapacity`, `GroupInServiceCapacity`, `GroupPendingCapacity`, `GroupMinSize`, `GroupMaxSize`, `GroupInServiceInstances`, `GroupPendingInstances`, `GroupStandbyInstances`, `GroupStandbyCapacity`, `GroupTerminatingCapacity`, `GroupTerminatingInstances`, `GroupTotalCapacity`, `GroupTotalInstances` | `list(string)` | `null` | no |
-| <a name="input_enclave_options"></a> [enclave\_options](#input\_enclave\_options) | Enable Nitro Enclaves on launched instances | `map(string)` | `null` | no |
+| <a name="input_enabled_metrics"></a> [enabled\_metrics](#input\_enabled\_metrics) | A list of metrics to collect. The allowed values are `GroupDesiredCapacity`, `GroupInServiceCapacity`, `GroupPendingCapacity`, `GroupMinSize`, `GroupMaxSize`, `GroupInServiceInstances`, `GroupPendingInstances`, `GroupStandbyInstances`, `GroupStandbyCapacity`, `GroupTerminatingCapacity`, `GroupTerminatingInstances`, `GroupTotalCapacity`, `GroupTotalInstances` | `list(string)` | `[]` | no |
+| <a name="input_enclave_options"></a> [enclave\_options](#input\_enclave\_options) | Enable Nitro Enclaves on launched instances | `map(string)` | `{}` | no |
 | <a name="input_force_delete"></a> [force\_delete](#input\_force\_delete) | Allows deleting the Auto Scaling Group without waiting for all instances in the pool to terminate. You can force an Auto Scaling Group to delete even if it's in the process of scaling a resource. Normally, Terraform drains all the instances before deleting the group. This bypasses that behavior and potentially leaves resources dangling | `bool` | `null` | no |
 | <a name="input_health_check_grace_period"></a> [health\_check\_grace\_period](#input\_health\_check\_grace\_period) | Time (in seconds) after instance comes into service before checking health | `number` | `null` | no |
 | <a name="input_health_check_type"></a> [health\_check\_type](#input\_health\_check\_type) | `EC2` or `ELB`. Controls how health checking is done | `string` | `null` | no |
-| <a name="input_hibernation_options"></a> [hibernation\_options](#input\_hibernation\_options) | The hibernation options for the instance | `map(string)` | `null` | no |
+| <a name="input_hibernation_options"></a> [hibernation\_options](#input\_hibernation\_options) | The hibernation options for the instance | `map(string)` | `{}` | no |
 | <a name="input_iam_instance_profile_arn"></a> [iam\_instance\_profile\_arn](#input\_iam\_instance\_profile\_arn) | Amazon Resource Name (ARN) of an existing IAM instance profile that provides permissions for the node group. Required if `create_iam_instance_profile` = `false` | `string` | `null` | no |
 | <a name="input_iam_role_additional_policies"></a> [iam\_role\_additional\_policies](#input\_iam\_role\_additional\_policies) | Additional policies to be added to the IAM role | `list(string)` | `[]` | no |
 | <a name="input_iam_role_attach_cni_policy"></a> [iam\_role\_attach\_cni\_policy](#input\_iam\_role\_attach\_cni\_policy) | Whether to attach the `AmazonEKS_CNI_Policy`/`AmazonEKS_CNI_IPv6_Policy` IAM policy to the IAM IAM role. WARNING: If set `false` the permissions must be assigned to the `aws-node` DaemonSet pods via another method or nodes will not be able to join the cluster | `bool` | `true` | no |
@@ -123,8 +123,8 @@ module "self_managed_node_group" {
 | <a name="input_iam_role_use_name_prefix"></a> [iam\_role\_use\_name\_prefix](#input\_iam\_role\_use\_name\_prefix) | Determines whether cluster IAM role name (`iam_role_name`) is used as a prefix | `bool` | `true` | no |
 | <a name="input_initial_lifecycle_hooks"></a> [initial\_lifecycle\_hooks](#input\_initial\_lifecycle\_hooks) | One or more Lifecycle Hooks to attach to the Auto Scaling Group before instances are launched. The syntax is exactly the same as the separate `aws_autoscaling_lifecycle_hook` resource, without the `autoscaling_group_name` attribute. Please note that this will only work when creating a new Auto Scaling Group. For all other use-cases, please use `aws_autoscaling_lifecycle_hook` resource | `list(map(string))` | `[]` | no |
 | <a name="input_instance_initiated_shutdown_behavior"></a> [instance\_initiated\_shutdown\_behavior](#input\_instance\_initiated\_shutdown\_behavior) | Shutdown behavior for the instance. Can be `stop` or `terminate`. (Default: `stop`) | `string` | `null` | no |
-| <a name="input_instance_market_options"></a> [instance\_market\_options](#input\_instance\_market\_options) | The market (purchasing) option for the instance | `any` | `null` | no |
-| <a name="input_instance_refresh"></a> [instance\_refresh](#input\_instance\_refresh) | If this block is configured, start an Instance Refresh when this Auto Scaling Group is updated | `any` | `null` | no |
+| <a name="input_instance_market_options"></a> [instance\_market\_options](#input\_instance\_market\_options) | The market (purchasing) option for the instance | `any` | `{}` | no |
+| <a name="input_instance_refresh"></a> [instance\_refresh](#input\_instance\_refresh) | If this block is configured, start an Instance Refresh when this Auto Scaling Group is updated | `any` | `{}` | no |
 | <a name="input_instance_type"></a> [instance\_type](#input\_instance\_type) | The type of the instance to launch | `string` | `""` | no |
 | <a name="input_kernel_id"></a> [kernel\_id](#input\_kernel\_id) | The kernel ID | `string` | `null` | no |
 | <a name="input_key_name"></a> [key\_name](#input\_key\_name) | The key name that should be used for the instance | `string` | `null` | no |
@@ -134,7 +134,7 @@ module "self_managed_node_group" {
 | <a name="input_launch_template_tags"></a> [launch\_template\_tags](#input\_launch\_template\_tags) | A map of additional tags to add to the tag\_specifications of launch template created | `map(string)` | `{}` | no |
 | <a name="input_launch_template_use_name_prefix"></a> [launch\_template\_use\_name\_prefix](#input\_launch\_template\_use\_name\_prefix) | Determines whether to use `launch_template_name` as is or create a unique name beginning with the `launch_template_name` as the prefix | `bool` | `true` | no |
 | <a name="input_launch_template_version"></a> [launch\_template\_version](#input\_launch\_template\_version) | Launch template version. Can be version number, `$Latest`, or `$Default` | `string` | `null` | no |
-| <a name="input_license_specifications"></a> [license\_specifications](#input\_license\_specifications) | A list of license specifications to associate with | `map(string)` | `null` | no |
+| <a name="input_license_specifications"></a> [license\_specifications](#input\_license\_specifications) | A list of license specifications to associate with | `map(string)` | `{}` | no |
 | <a name="input_max_instance_lifetime"></a> [max\_instance\_lifetime](#input\_max\_instance\_lifetime) | The maximum amount of time, in seconds, that an instance can be in service, values must be either equal to 0 or between 604800 and 31536000 seconds | `number` | `null` | no |
 | <a name="input_max_size"></a> [max\_size](#input\_max\_size) | The maximum size of the autoscaling group | `number` | `3` | no |
 | <a name="input_metadata_options"></a> [metadata\_options](#input\_metadata\_options) | Customize the metadata options for the instance | `map(string)` | <pre>{<br>  "http_endpoint": "enabled",<br>  "http_put_response_hop_limit": 2,<br>  "http_tokens": "required"<br>}</pre> | no |
@@ -144,7 +144,7 @@ module "self_managed_node_group" {
 | <a name="input_mixed_instances_policy"></a> [mixed\_instances\_policy](#input\_mixed\_instances\_policy) | Configuration block containing settings to define launch targets for Auto Scaling groups | `any` | `null` | no |
 | <a name="input_name"></a> [name](#input\_name) | Name of the Self managed Node Group | `string` | `""` | no |
 | <a name="input_network_interfaces"></a> [network\_interfaces](#input\_network\_interfaces) | Customize network interfaces to be attached at instance boot time | `list(any)` | `[]` | no |
-| <a name="input_placement"></a> [placement](#input\_placement) | The placement of the instance | `map(string)` | `null` | no |
+| <a name="input_placement"></a> [placement](#input\_placement) | The placement of the instance | `map(string)` | `{}` | no |
 | <a name="input_placement_group"></a> [placement\_group](#input\_placement\_group) | The name of the placement group into which you'll launch your instances, if any | `string` | `null` | no |
 | <a name="input_platform"></a> [platform](#input\_platform) | Identifies if the OS platform is `bottlerocket`, `linux`, or `windows` based | `string` | `"linux"` | no |
 | <a name="input_post_bootstrap_user_data"></a> [post\_bootstrap\_user\_data](#input\_post\_bootstrap\_user\_data) | User data that is appended to the user data script after of the EKS bootstrap script. Not used when `platform` = `bottlerocket` | `string` | `""` | no |
@@ -159,10 +159,10 @@ module "self_managed_node_group" {
 | <a name="input_security_group_use_name_prefix"></a> [security\_group\_use\_name\_prefix](#input\_security\_group\_use\_name\_prefix) | Determines whether the security group name (`security_group_name`) is used as a prefix | `string` | `true` | no |
 | <a name="input_service_linked_role_arn"></a> [service\_linked\_role\_arn](#input\_service\_linked\_role\_arn) | The ARN of the service-linked role that the ASG will use to call other AWS services | `string` | `null` | no |
 | <a name="input_subnet_ids"></a> [subnet\_ids](#input\_subnet\_ids) | A list of subnet IDs to launch resources in. Subnets automatically determine which availability zones the group will reside. Conflicts with `availability_zones` | `list(string)` | `null` | no |
-| <a name="input_suspended_processes"></a> [suspended\_processes](#input\_suspended\_processes) | A list of processes to suspend for the Auto Scaling Group. The allowed values are `Launch`, `Terminate`, `HealthCheck`, `ReplaceUnhealthy`, `AZRebalance`, `AlarmNotification`, `ScheduledActions`, `AddToLoadBalancer`. Note that if you suspend either the `Launch` or `Terminate` process types, it can prevent your Auto Scaling Group from functioning properly | `list(string)` | `null` | no |
+| <a name="input_suspended_processes"></a> [suspended\_processes](#input\_suspended\_processes) | A list of processes to suspend for the Auto Scaling Group. The allowed values are `Launch`, `Terminate`, `HealthCheck`, `ReplaceUnhealthy`, `AZRebalance`, `AlarmNotification`, `ScheduledActions`, `AddToLoadBalancer`. Note that if you suspend either the `Launch` or `Terminate` process types, it can prevent your Auto Scaling Group from functioning properly | `list(string)` | `[]` | no |
 | <a name="input_tags"></a> [tags](#input\_tags) | A map of tags to add to all resources | `map(string)` | `{}` | no |
 | <a name="input_target_group_arns"></a> [target\_group\_arns](#input\_target\_group\_arns) | A set of `aws_alb_target_group` ARNs, for use with Application or Network Load Balancing | `list(string)` | `[]` | no |
-| <a name="input_termination_policies"></a> [termination\_policies](#input\_termination\_policies) | A list of policies to decide how the instances in the Auto Scaling Group should be terminated. The allowed values are `OldestInstance`, `NewestInstance`, `OldestLaunchConfiguration`, `ClosestToNextInstanceHour`, `OldestLaunchTemplate`, `AllocationStrategy`, `Default` | `list(string)` | `null` | no |
+| <a name="input_termination_policies"></a> [termination\_policies](#input\_termination\_policies) | A list of policies to decide how the instances in the Auto Scaling Group should be terminated. The allowed values are `OldestInstance`, `NewestInstance`, `OldestLaunchConfiguration`, `ClosestToNextInstanceHour`, `OldestLaunchTemplate`, `AllocationStrategy`, `Default` | `list(string)` | `[]` | no |
 | <a name="input_update_launch_template_default_version"></a> [update\_launch\_template\_default\_version](#input\_update\_launch\_template\_default\_version) | Whether to update Default Version each update. Conflicts with `launch_template_default_version` | `bool` | `true` | no |
 | <a name="input_use_default_tags"></a> [use\_default\_tags](#input\_use\_default\_tags) | Enables/disables the use of provider default tags in the tag\_specifications of the Auto Scaling group | `bool` | `false` | no |
 | <a name="input_use_mixed_instances_policy"></a> [use\_mixed\_instances\_policy](#input\_use\_mixed\_instances\_policy) | Determines whether to use a mixed instances policy in the autoscaling group or not | `bool` | `false` | no |
@@ -172,7 +172,7 @@ module "self_managed_node_group" {
 | <a name="input_vpc_security_group_ids"></a> [vpc\_security\_group\_ids](#input\_vpc\_security\_group\_ids) | A list of security group IDs to associate | `list(string)` | `[]` | no |
 | <a name="input_wait_for_capacity_timeout"></a> [wait\_for\_capacity\_timeout](#input\_wait\_for\_capacity\_timeout) | A maximum duration that Terraform should wait for ASG instances to be healthy before timing out. (See also Waiting for Capacity below.) Setting this to '0' causes Terraform to skip all Capacity Waiting behavior. | `string` | `null` | no |
 | <a name="input_wait_for_elb_capacity"></a> [wait\_for\_elb\_capacity](#input\_wait\_for\_elb\_capacity) | Setting this will cause Terraform to wait for exactly this number of healthy instances in all attached load balancers on both create and update operations. Takes precedence over `min_elb_capacity` behavior. | `number` | `null` | no |
-| <a name="input_warm_pool"></a> [warm\_pool](#input\_warm\_pool) | If this block is configured, add a Warm Pool to the specified Auto Scaling group | `any` | `null` | no |
+| <a name="input_warm_pool"></a> [warm\_pool](#input\_warm\_pool) | If this block is configured, add a Warm Pool to the specified Auto Scaling group | `any` | `{}` | no |
 
 ## Outputs
 
diff --git a/modules/self-managed-node-group/main.tf b/modules/self-managed-node-group/main.tf
index 909910ff05..f74fb8189e 100644
--- a/modules/self-managed-node-group/main.tf
+++ b/modules/self-managed-node-group/main.tf
@@ -94,7 +94,7 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "capacity_reservation_specification" {
-    for_each = var.capacity_reservation_specification != null ? [var.capacity_reservation_specification] : []
+    for_each = length(var.capacity_reservation_specification) > 0 ? [var.capacity_reservation_specification] : []
     content {
       capacity_reservation_preference = lookup(capacity_reservation_specification.value, "capacity_reservation_preference", null)
 
@@ -108,7 +108,7 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "cpu_options" {
-    for_each = var.cpu_options != null ? [var.cpu_options] : []
+    for_each = length(var.cpu_options) > 0 ? [var.cpu_options] : []
     content {
       core_count       = cpu_options.value.core_count
       threads_per_core = cpu_options.value.threads_per_core
@@ -116,35 +116,35 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "credit_specification" {
-    for_each = var.credit_specification != null ? [var.credit_specification] : []
+    for_each = length(var.credit_specification) > 0 ? [var.credit_specification] : []
     content {
       cpu_credits = credit_specification.value.cpu_credits
     }
   }
 
   dynamic "elastic_gpu_specifications" {
-    for_each = var.elastic_gpu_specifications != null ? [var.elastic_gpu_specifications] : []
+    for_each = length(var.elastic_gpu_specifications) > 0 ? [var.elastic_gpu_specifications] : []
     content {
       type = elastic_gpu_specifications.value.type
     }
   }
 
   dynamic "elastic_inference_accelerator" {
-    for_each = var.elastic_inference_accelerator != null ? [var.elastic_inference_accelerator] : []
+    for_each = length(var.elastic_inference_accelerator) > 0 ? [var.elastic_inference_accelerator] : []
     content {
       type = elastic_inference_accelerator.value.type
     }
   }
 
   dynamic "enclave_options" {
-    for_each = var.enclave_options != null ? [var.enclave_options] : []
+    for_each = length(var.enclave_options) > 0 ? [var.enclave_options] : []
     content {
       enabled = enclave_options.value.enabled
     }
   }
 
   dynamic "hibernation_options" {
-    for_each = var.hibernation_options != null ? [var.hibernation_options] : []
+    for_each = length(var.hibernation_options) > 0 ? [var.hibernation_options] : []
     content {
       configured = hibernation_options.value.configured
     }
@@ -155,12 +155,12 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "instance_market_options" {
-    for_each = var.instance_market_options != null ? [var.instance_market_options] : []
+    for_each = length(var.instance_market_options) > 0 ? [var.instance_market_options] : []
     content {
       market_type = instance_market_options.value.market_type
 
       dynamic "spot_options" {
-        for_each = lookup(instance_market_options.value, "spot_options", null) != null ? [instance_market_options.value.spot_options] : []
+        for_each = length(lookup(instance_market_options.value, "spot_options", {})) > 0 ? [instance_market_options.value.spot_options] : []
         content {
           block_duration_minutes         = lookup(spot_options.value, "block_duration_minutes", null)
           instance_interruption_behavior = lookup(spot_options.value, "instance_interruption_behavior", null)
@@ -173,14 +173,14 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "license_specification" {
-    for_each = var.license_specifications != null ? [var.license_specifications] : []
+    for_each = length(var.license_specifications) > 0 ? [var.license_specifications] : []
     content {
       license_configuration_arn = license_specifications.value.license_configuration_arn
     }
   }
 
   dynamic "metadata_options" {
-    for_each = var.metadata_options != null ? [var.metadata_options] : []
+    for_each = length(var.metadata_options) > 0 ? [var.metadata_options] : []
     content {
       http_endpoint               = lookup(metadata_options.value, "http_endpoint", null)
       http_tokens                 = lookup(metadata_options.value, "http_tokens", null)
@@ -218,7 +218,7 @@ resource "aws_launch_template" "this" {
   }
 
   dynamic "placement" {
-    for_each = var.placement != null ? [var.placement] : []
+    for_each = length(var.placement) > 0 ? [var.placement] : []
     content {
       affinity          = lookup(placement.value, "affinity", null)
       availability_zone = lookup(placement.value, "availability_zone", null)
@@ -318,13 +318,13 @@ resource "aws_autoscaling_group" "this" {
   }
 
   dynamic "instance_refresh" {
-    for_each = var.instance_refresh != null ? [var.instance_refresh] : []
+    for_each = length(var.instance_refresh) > 0 ? [var.instance_refresh] : []
     content {
       strategy = instance_refresh.value.strategy
       triggers = lookup(instance_refresh.value, "triggers", null)
 
       dynamic "preferences" {
-        for_each = lookup(instance_refresh.value, "preferences", null) != null ? [instance_refresh.value.preferences] : []
+        for_each = length(lookup(instance_refresh.value, "preferences", {})) > 0 ? [instance_refresh.value.preferences] : []
         content {
           instance_warmup        = lookup(preferences.value, "instance_warmup", null)
           min_healthy_percentage = lookup(preferences.value, "min_healthy_percentage", null)
@@ -363,7 +363,7 @@ resource "aws_autoscaling_group" "this" {
             weighted_capacity = lookup(override.value, "weighted_capacity", null)
 
             dynamic "launch_template_specification" {
-              for_each = lookup(override.value, "launch_template_specification", null) != null ? override.value.launch_template_specification : []
+              for_each = length(lookup(override.value, "launch_template_specification", {})) > 0 ? override.value.launch_template_specification : []
               content {
                 launch_template_id = lookup(launch_template_specification.value, "launch_template_id", null)
               }
@@ -375,7 +375,7 @@ resource "aws_autoscaling_group" "this" {
   }
 
   dynamic "warm_pool" {
-    for_each = var.warm_pool != null ? [var.warm_pool] : []
+    for_each = length(var.warm_pool) > 0 ? [var.warm_pool] : []
     content {
       pool_state                  = lookup(warm_pool.value, "pool_state", null)
       min_size                    = lookup(warm_pool.value, "min_size", null)
diff --git a/modules/self-managed-node-group/variables.tf b/modules/self-managed-node-group/variables.tf
index d3fcd726c2..5aa20066c5 100644
--- a/modules/self-managed-node-group/variables.tf
+++ b/modules/self-managed-node-group/variables.tf
@@ -135,55 +135,55 @@ variable "block_device_mappings" {
 variable "capacity_reservation_specification" {
   description = "Targeting for EC2 capacity reservations"
   type        = any
-  default     = null
+  default     = {}
 }
 
 variable "cpu_options" {
   description = "The CPU options for the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "credit_specification" {
   description = "Customize the credit specification of the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "elastic_gpu_specifications" {
   description = "The elastic GPU to attach to the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "elastic_inference_accelerator" {
   description = "Configuration block containing an Elastic Inference Accelerator to attach to the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "enclave_options" {
   description = "Enable Nitro Enclaves on launched instances"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "hibernation_options" {
   description = "The hibernation options for the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "instance_market_options" {
   description = "The market (purchasing) option for the instance"
   type        = any
-  default     = null
+  default     = {}
 }
 
 variable "license_specifications" {
   description = "A list of license specifications to associate with"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "network_interfaces" {
@@ -195,7 +195,7 @@ variable "network_interfaces" {
 variable "placement" {
   description = "The placement of the instance"
   type        = map(string)
-  default     = null
+  default     = {}
 }
 
 variable "ebs_optimized" {
@@ -389,13 +389,13 @@ variable "force_delete" {
 variable "termination_policies" {
   description = "A list of policies to decide how the instances in the Auto Scaling Group should be terminated. The allowed values are `OldestInstance`, `NewestInstance`, `OldestLaunchConfiguration`, `ClosestToNextInstanceHour`, `OldestLaunchTemplate`, `AllocationStrategy`, `Default`"
   type        = list(string)
-  default     = null
+  default     = []
 }
 
 variable "suspended_processes" {
   description = "A list of processes to suspend for the Auto Scaling Group. The allowed values are `Launch`, `Terminate`, `HealthCheck`, `ReplaceUnhealthy`, `AZRebalance`, `AlarmNotification`, `ScheduledActions`, `AddToLoadBalancer`. Note that if you suspend either the `Launch` or `Terminate` process types, it can prevent your Auto Scaling Group from functioning properly"
   type        = list(string)
-  default     = null
+  default     = []
 }
 
 variable "max_instance_lifetime" {
@@ -407,7 +407,7 @@ variable "max_instance_lifetime" {
 variable "enabled_metrics" {
   description = "A list of metrics to collect. The allowed values are `GroupDesiredCapacity`, `GroupInServiceCapacity`, `GroupPendingCapacity`, `GroupMinSize`, `GroupMaxSize`, `GroupInServiceInstances`, `GroupPendingInstances`, `GroupStandbyInstances`, `GroupStandbyCapacity`, `GroupTerminatingCapacity`, `GroupTerminatingInstances`, `GroupTotalCapacity`, `GroupTotalInstances`"
   type        = list(string)
-  default     = null
+  default     = []
 }
 
 variable "metrics_granularity" {
@@ -431,7 +431,7 @@ variable "initial_lifecycle_hooks" {
 variable "instance_refresh" {
   description = "If this block is configured, start an Instance Refresh when this Auto Scaling Group is updated"
   type        = any
-  default     = null
+  default     = {}
 }
 
 variable "use_mixed_instances_policy" {
@@ -449,7 +449,7 @@ variable "mixed_instances_policy" {
 variable "warm_pool" {
   description = "If this block is configured, add a Warm Pool to the specified Auto Scaling group"
   type        = any
-  default     = null
+  default     = {}
 }
 
 variable "delete_timeout" {
diff --git a/node_groups.tf b/node_groups.tf
index 8c0916ade3..76d2880323 100644
--- a/node_groups.tf
+++ b/node_groups.tf
@@ -218,7 +218,7 @@ module "fargate_profile" {
   iam_role_permissions_boundary = try(each.value.iam_role_permissions_boundary, var.fargate_profile_defaults.iam_role_permissions_boundary, null)
   iam_role_tags                 = try(each.value.iam_role_tags, var.fargate_profile_defaults.iam_role_tags, {})
   iam_role_attach_cni_policy    = try(each.value.iam_role_attach_cni_policy, var.fargate_profile_defaults.iam_role_attach_cni_policy, true)
-  iam_role_additional_policies  = try(each.value.iam_role_additional_policies, var.fargate_profile_defaults.iam_role_additional_policies, [])
+  iam_role_additional_policies  = try(each.value.iam_role_additional_policies, var.fargate_profile_defaults.iam_role_additional_policies, {})
 
   tags = merge(var.tags, try(each.value.tags, var.fargate_profile_defaults.tags, {}))
 }
@@ -292,18 +292,18 @@ module "eks_managed_node_group" {
   ram_disk_id                            = try(each.value.ram_disk_id, var.eks_managed_node_group_defaults.ram_disk_id, null)
 
   block_device_mappings              = try(each.value.block_device_mappings, var.eks_managed_node_group_defaults.block_device_mappings, {})
-  capacity_reservation_specification = try(each.value.capacity_reservation_specification, var.eks_managed_node_group_defaults.capacity_reservation_specification, null)
-  cpu_options                        = try(each.value.cpu_options, var.eks_managed_node_group_defaults.cpu_options, null)
-  credit_specification               = try(each.value.credit_specification, var.eks_managed_node_group_defaults.credit_specification, null)
-  elastic_gpu_specifications         = try(each.value.elastic_gpu_specifications, var.eks_managed_node_group_defaults.elastic_gpu_specifications, null)
-  elastic_inference_accelerator      = try(each.value.elastic_inference_accelerator, var.eks_managed_node_group_defaults.elastic_inference_accelerator, null)
-  enclave_options                    = try(each.value.enclave_options, var.eks_managed_node_group_defaults.enclave_options, null)
-  instance_market_options            = try(each.value.instance_market_options, var.eks_managed_node_group_defaults.instance_market_options, null)
-  license_specifications             = try(each.value.license_specifications, var.eks_managed_node_group_defaults.license_specifications, null)
+  capacity_reservation_specification = try(each.value.capacity_reservation_specification, var.eks_managed_node_group_defaults.capacity_reservation_specification, {})
+  cpu_options                        = try(each.value.cpu_options, var.eks_managed_node_group_defaults.cpu_options, {})
+  credit_specification               = try(each.value.credit_specification, var.eks_managed_node_group_defaults.credit_specification, {})
+  elastic_gpu_specifications         = try(each.value.elastic_gpu_specifications, var.eks_managed_node_group_defaults.elastic_gpu_specifications, {})
+  elastic_inference_accelerator      = try(each.value.elastic_inference_accelerator, var.eks_managed_node_group_defaults.elastic_inference_accelerator, {})
+  enclave_options                    = try(each.value.enclave_options, var.eks_managed_node_group_defaults.enclave_options, {})
+  instance_market_options            = try(each.value.instance_market_options, var.eks_managed_node_group_defaults.instance_market_options, {})
+  license_specifications             = try(each.value.license_specifications, var.eks_managed_node_group_defaults.license_specifications, {})
   metadata_options                   = try(each.value.metadata_options, var.eks_managed_node_group_defaults.metadata_options, local.metadata_options)
   enable_monitoring                  = try(each.value.enable_monitoring, var.eks_managed_node_group_defaults.enable_monitoring, true)
   network_interfaces                 = try(each.value.network_interfaces, var.eks_managed_node_group_defaults.network_interfaces, [])
-  placement                          = try(each.value.placement, var.eks_managed_node_group_defaults.placement, null)
+  placement                          = try(each.value.placement, var.eks_managed_node_group_defaults.placement, {})
 
   # IAM role
   create_iam_role               = try(each.value.create_iam_role, var.eks_managed_node_group_defaults.create_iam_role, true)
@@ -364,28 +364,28 @@ module "self_managed_node_group" {
   default_cooldown          = try(each.value.default_cooldown, var.self_managed_node_group_defaults.default_cooldown, null)
   protect_from_scale_in     = try(each.value.protect_from_scale_in, var.self_managed_node_group_defaults.protect_from_scale_in, null)
 
-  target_group_arns         = try(each.value.target_group_arns, var.self_managed_node_group_defaults.target_group_arns, null)
+  target_group_arns         = try(each.value.target_group_arns, var.self_managed_node_group_defaults.target_group_arns, [])
   placement_group           = try(each.value.placement_group, var.self_managed_node_group_defaults.placement_group, null)
   health_check_type         = try(each.value.health_check_type, var.self_managed_node_group_defaults.health_check_type, null)
   health_check_grace_period = try(each.value.health_check_grace_period, var.self_managed_node_group_defaults.health_check_grace_period, null)
 
   force_delete          = try(each.value.force_delete, var.self_managed_node_group_defaults.force_delete, null)
-  termination_policies  = try(each.value.termination_policies, var.self_managed_node_group_defaults.termination_policies, null)
-  suspended_processes   = try(each.value.suspended_processes, var.self_managed_node_group_defaults.suspended_processes, null)
+  termination_policies  = try(each.value.termination_policies, var.self_managed_node_group_defaults.termination_policies, [])
+  suspended_processes   = try(each.value.suspended_processes, var.self_managed_node_group_defaults.suspended_processes, [])
   max_instance_lifetime = try(each.value.max_instance_lifetime, var.self_managed_node_group_defaults.max_instance_lifetime, null)
 
-  enabled_metrics         = try(each.value.enabled_metrics, var.self_managed_node_group_defaults.enabled_metrics, null)
+  enabled_metrics         = try(each.value.enabled_metrics, var.self_managed_node_group_defaults.enabled_metrics, [])
   metrics_granularity     = try(each.value.metrics_granularity, var.self_managed_node_group_defaults.metrics_granularity, null)
   service_linked_role_arn = try(each.value.service_linked_role_arn, var.self_managed_node_group_defaults.service_linked_role_arn, null)
 
   initial_lifecycle_hooks    = try(each.value.initial_lifecycle_hooks, var.self_managed_node_group_defaults.initial_lifecycle_hooks, [])
-  instance_refresh           = try(each.value.instance_refresh, var.self_managed_node_group_defaults.instance_refresh, null)
+  instance_refresh           = try(each.value.instance_refresh, var.self_managed_node_group_defaults.instance_refresh, {})
   use_mixed_instances_policy = try(each.value.use_mixed_instances_policy, var.self_managed_node_group_defaults.use_mixed_instances_policy, false)
   mixed_instances_policy     = try(each.value.mixed_instances_policy, var.self_managed_node_group_defaults.mixed_instances_policy, null)
-  warm_pool                  = try(each.value.warm_pool, var.self_managed_node_group_defaults.warm_pool, null)
+  warm_pool                  = try(each.value.warm_pool, var.self_managed_node_group_defaults.warm_pool, {})
 
   create_schedule = try(each.value.create_schedule, var.self_managed_node_group_defaults.create_schedule, false)
-  schedules       = try(each.value.schedules, var.self_managed_node_group_defaults.schedules, null)
+  schedules       = try(each.value.schedules, var.self_managed_node_group_defaults.schedules, {})
 
   delete_timeout         = try(each.value.delete_timeout, var.self_managed_node_group_defaults.delete_timeout, null)
   use_default_tags       = try(each.value.use_default_tags, var.self_managed_node_group_defaults.use_default_tags, false)
@@ -421,20 +421,20 @@ module "self_managed_node_group" {
   kernel_id                              = try(each.value.kernel_id, var.self_managed_node_group_defaults.kernel_id, null)
   ram_disk_id                            = try(each.value.ram_disk_id, var.self_managed_node_group_defaults.ram_disk_id, null)
 
-  block_device_mappings              = try(each.value.block_device_mappings, var.self_managed_node_group_defaults.block_device_mappings, [])
-  capacity_reservation_specification = try(each.value.capacity_reservation_specification, var.self_managed_node_group_defaults.capacity_reservation_specification, null)
-  cpu_options                        = try(each.value.cpu_options, var.self_managed_node_group_defaults.cpu_options, null)
-  credit_specification               = try(each.value.credit_specification, var.self_managed_node_group_defaults.credit_specification, null)
-  elastic_gpu_specifications         = try(each.value.elastic_gpu_specifications, var.self_managed_node_group_defaults.elastic_gpu_specifications, null)
-  elastic_inference_accelerator      = try(each.value.elastic_inference_accelerator, var.self_managed_node_group_defaults.elastic_inference_accelerator, null)
-  enclave_options                    = try(each.value.enclave_options, var.self_managed_node_group_defaults.enclave_options, null)
-  hibernation_options                = try(each.value.hibernation_options, var.self_managed_node_group_defaults.hibernation_options, null)
-  instance_market_options            = try(each.value.instance_market_options, var.self_managed_node_group_defaults.instance_market_options, null)
-  license_specifications             = try(each.value.license_specifications, var.self_managed_node_group_defaults.license_specifications, null)
+  block_device_mappings              = try(each.value.block_device_mappings, var.self_managed_node_group_defaults.block_device_mappings, {})
+  capacity_reservation_specification = try(each.value.capacity_reservation_specification, var.self_managed_node_group_defaults.capacity_reservation_specification, {})
+  cpu_options                        = try(each.value.cpu_options, var.self_managed_node_group_defaults.cpu_options, {})
+  credit_specification               = try(each.value.credit_specification, var.self_managed_node_group_defaults.credit_specification, {})
+  elastic_gpu_specifications         = try(each.value.elastic_gpu_specifications, var.self_managed_node_group_defaults.elastic_gpu_specifications, {})
+  elastic_inference_accelerator      = try(each.value.elastic_inference_accelerator, var.self_managed_node_group_defaults.elastic_inference_accelerator, {})
+  enclave_options                    = try(each.value.enclave_options, var.self_managed_node_group_defaults.enclave_options, {})
+  hibernation_options                = try(each.value.hibernation_options, var.self_managed_node_group_defaults.hibernation_options, {})
+  instance_market_options            = try(each.value.instance_market_options, var.self_managed_node_group_defaults.instance_market_options, {})
+  license_specifications             = try(each.value.license_specifications, var.self_managed_node_group_defaults.license_specifications, {})
   metadata_options                   = try(each.value.metadata_options, var.self_managed_node_group_defaults.metadata_options, local.metadata_options)
   enable_monitoring                  = try(each.value.enable_monitoring, var.self_managed_node_group_defaults.enable_monitoring, true)
   network_interfaces                 = try(each.value.network_interfaces, var.self_managed_node_group_defaults.network_interfaces, [])
-  placement                          = try(each.value.placement, var.self_managed_node_group_defaults.placement, null)
+  placement                          = try(each.value.placement, var.self_managed_node_group_defaults.placement, {})
 
   # IAM role
   create_iam_instance_profile   = try(each.value.create_iam_instance_profile, var.self_managed_node_group_defaults.create_iam_instance_profile, true)