diff --git a/autogen/main/cluster.tf.tmpl b/autogen/main/cluster.tf.tmpl
index 330e782756..1324b9c0d7 100644
--- a/autogen/main/cluster.tf.tmpl
+++ b/autogen/main/cluster.tf.tmpl
@@ -890,7 +890,7 @@ resource "google_container_node_pool" "windows_pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
diff --git a/cluster.tf b/cluster.tf
index 8b083f07ba..7f6368eef2 100644
--- a/cluster.tf
+++ b/cluster.tf
@@ -600,7 +600,7 @@ resource "google_container_node_pool" "pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
@@ -890,7 +890,7 @@ resource "google_container_node_pool" "windows_pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
diff --git a/modules/beta-private-cluster-update-variant/cluster.tf b/modules/beta-private-cluster-update-variant/cluster.tf
index 4c01762c72..abfe3c32c2 100644
--- a/modules/beta-private-cluster-update-variant/cluster.tf
+++ b/modules/beta-private-cluster-update-variant/cluster.tf
@@ -768,7 +768,7 @@ resource "google_container_node_pool" "pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
@@ -1072,7 +1072,7 @@ resource "google_container_node_pool" "windows_pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
diff --git a/modules/beta-private-cluster/cluster.tf b/modules/beta-private-cluster/cluster.tf
index 1d5f832021..3bf754be3b 100644
--- a/modules/beta-private-cluster/cluster.tf
+++ b/modules/beta-private-cluster/cluster.tf
@@ -685,7 +685,7 @@ resource "google_container_node_pool" "pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
@@ -988,7 +988,7 @@ resource "google_container_node_pool" "windows_pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
diff --git a/modules/beta-public-cluster-update-variant/cluster.tf b/modules/beta-public-cluster-update-variant/cluster.tf
index 04baad07c0..51d4a55e0c 100644
--- a/modules/beta-public-cluster-update-variant/cluster.tf
+++ b/modules/beta-public-cluster-update-variant/cluster.tf
@@ -747,7 +747,7 @@ resource "google_container_node_pool" "pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
@@ -1051,7 +1051,7 @@ resource "google_container_node_pool" "windows_pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
diff --git a/modules/beta-public-cluster/cluster.tf b/modules/beta-public-cluster/cluster.tf
index b395b13bd4..043c89402a 100644
--- a/modules/beta-public-cluster/cluster.tf
+++ b/modules/beta-public-cluster/cluster.tf
@@ -664,7 +664,7 @@ resource "google_container_node_pool" "pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
@@ -967,7 +967,7 @@ resource "google_container_node_pool" "windows_pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
diff --git a/modules/private-cluster-update-variant/cluster.tf b/modules/private-cluster-update-variant/cluster.tf
index c29d15ecb4..a3bfeb52b5 100644
--- a/modules/private-cluster-update-variant/cluster.tf
+++ b/modules/private-cluster-update-variant/cluster.tf
@@ -704,7 +704,7 @@ resource "google_container_node_pool" "pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
@@ -995,7 +995,7 @@ resource "google_container_node_pool" "windows_pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
diff --git a/modules/private-cluster/cluster.tf b/modules/private-cluster/cluster.tf
index dcbe415869..44966b2f06 100644
--- a/modules/private-cluster/cluster.tf
+++ b/modules/private-cluster/cluster.tf
@@ -621,7 +621,7 @@ resource "google_container_node_pool" "pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(
@@ -911,7 +911,7 @@ resource "google_container_node_pool" "windows_pools" {
       content {
         consume_reservation_type = reservation_affinity.value.consume_reservation_type
         key                      = reservation_affinity.value.key
-        values                   = split(",", reservation_affinity.value.values)
+        values                   = reservation_affinity.value.values == null ? null : split(",", reservation_affinity.value.values)
       }
     }
     labels = merge(