eks-cluster-upgrade: Bug: Error occurred while upgrading Node Group in EC2 instance created through Karpenter

Expected Behaviour

I tried to upgrade via eksupgrade CLI from 1.25 to 1.26.

Unfortunately, I’ve got an error about checking node group stage. I created EKS Cluster via Terraform and there’s no issues about it.

And the instance where the error occurred is an instance created through Karpenter.

As far as I know, Karpenter doesn’t generate nodes via ASG, do I need an ASG name to use the eksupgrade CLI ?

Please let me know what’s the best way to upgrade EKS Cluster that in using Karpenter via eksupgrade CLI.

Current Behaviour

Code snippet

eksupgrade --force <CLUSTER_NAME> 1.26 ap-northeast-2

Possible Solution

No response

Steps to Reproduce

eksupgrade --force <CLUSTER_NAME> 1.26 ap-northeast-2

Amazon EKS upgrade version

1.26

Python runtime version

3.11

Packaging format used

PyPi

Debugging logs

i-0f8bafc14f3d4bc9c cannot be upgraded because the cluster version is not compatible with the node version
Error occurred while checking node group details - Error: cannot access local variable 'autoscale_group_name' where it is not associated with a value

Post flight unsuccessful because of the following errors: ["Error occurred while checking node group details cannot access local variable 'autoscale_group_name' where it is not associated with a value"]
Post flight check for cluster <CLUSTER_NAME> failed after it upgraded