diff --git a/examples/complete/main.tf b/examples/complete/main.tf
index 6777788..85b02b1 100644
--- a/examples/complete/main.tf
+++ b/examples/complete/main.tf
@@ -192,6 +192,10 @@ module "eks_managed_node_group" {
 
   vpc_id     = module.vpc.vpc_id
   subnet_ids = module.vpc.private_subnets
+  vpc_security_group_ids = [
+    module.eks.cluster_primary_security_group_id,
+    module.eks.cluster_security_group_id,
+  ]
 
   tags = merge(local.tags, { Separate = "eks-managed-node-group" })
 }
diff --git a/modules/eks-managed-node-group/main.tf b/modules/eks-managed-node-group/main.tf
index ecb0b7e..0341806 100644
--- a/modules/eks-managed-node-group/main.tf
+++ b/modules/eks-managed-node-group/main.tf
@@ -165,7 +165,7 @@ resource "aws_launch_template" "this" {
       dynamic "spot_options" {
         for_each = lookup(instance_market_options.value, "spot_options", null) != null ? [instance_market_options.value.spot_options] : []
         content {
-          block_duration_minutes         = spot_options.value.block_duration_minutes
+          block_duration_minutes         = lookup(spot_options.value, "block_duration_minutes", null)
           instance_interruption_behavior = lookup(spot_options.value, "instance_interruption_behavior", null)
           max_price                      = lookup(spot_options.value, "max_price", null)
           spot_instance_type             = lookup(spot_options.value, "spot_instance_type", null)
diff --git a/modules/self-managed-node-group/main.tf b/modules/self-managed-node-group/main.tf
index 3f0efc3..1b7ca66 100644
--- a/modules/self-managed-node-group/main.tf
+++ b/modules/self-managed-node-group/main.tf
@@ -158,7 +158,7 @@ resource "aws_launch_template" "this" {
       dynamic "spot_options" {
         for_each = lookup(instance_market_options.value, "spot_options", null) != null ? [instance_market_options.value.spot_options] : []
         content {
-          block_duration_minutes         = spot_options.value.block_duration_minutes
+          block_duration_minutes         = lookup(spot_options.value, block_duration_minutes, null)
           instance_interruption_behavior = lookup(spot_options.value, "instance_interruption_behavior", null)
           max_price                      = lookup(spot_options.value, "max_price", null)
           spot_instance_type             = lookup(spot_options.value, "spot_instance_type", null)