diff --git a/cluster-autoscaler/cloudprovider/azure/azure_agent_pool.go b/cluster-autoscaler/cloudprovider/azure/azure_agent_pool.go
index 4b059e78a126..d5d0cdc9c810 100644
--- a/cluster-autoscaler/cloudprovider/azure/azure_agent_pool.go
+++ b/cluster-autoscaler/cloudprovider/azure/azure_agent_pool.go
@@ -71,6 +71,7 @@ func NewAgentPool(spec *dynamic.NodeGroupSpec, az *AzureManager) (*AgentPool, er
 		minSize: spec.MinSize,
 		maxSize: spec.MaxSize,
 		manager: az,
+		curSize: -1,
 	}
 
 	if err := as.initialize(); err != nil {
@@ -228,6 +229,10 @@ func (as *AgentPool) IncreaseSize(delta int) error {
 	as.mutex.Lock()
 	defer as.mutex.Unlock()
 
+	if as.curSize == -1 {
+		return fmt.Errorf("the availability set %s is under initialization, skipping IncreaseSize", as.Name)
+	}
+
 	if delta <= 0 {
 		return fmt.Errorf("size increase must be positive")
 	}
diff --git a/cluster-autoscaler/cloudprovider/azure/azure_scale_set.go b/cluster-autoscaler/cloudprovider/azure/azure_scale_set.go
index 007aeab34d35..f12ba1fda11f 100644
--- a/cluster-autoscaler/cloudprovider/azure/azure_scale_set.go
+++ b/cluster-autoscaler/cloudprovider/azure/azure_scale_set.go
@@ -314,6 +314,10 @@ func (scaleSet *ScaleSet) IncreaseSize(delta int) error {
 		return err
 	}
 
+	if size == -1 {
+		return fmt.Errorf("the scale set %s is under initialization, skipping IncreaseSize", scaleSet.Name)
+	}
+
 	if int(size)+delta > scaleSet.MaxSize() {
 		return fmt.Errorf("size increase too large - desired:%d max:%d", int(size)+delta, scaleSet.MaxSize())
 	}