panic: runtime error: index out of range

[a1exus]

while trying to follow Create cluster, I ran into following:

$ PROJECT=`gcloud config get-value project`
$ export KOPS_FEATURE_FLAGS=AlphaAllowGCE # to unlock the GCE features
$ kops create cluster test.k8s.local --zones us-east4-c,us-east4-b,us-east4-a --state gs://kops/ --project=${PROJECT} --authorization rbac --topology private --networking canal --bastion --ssh-public-key ~/.ssh/id_rsa.pub --master-count 3 --node-count 2 --cloud gce
$ kops create cluster --cloud gce --authorization rbac --topology private --networking canal --bastion --master-count 3 --node-count 2 --zones us-east4-c,us-east4-b,us-east4-a --ssh-public-key ~/.ssh/id_rsa.pub --state gs://kops/ test.k8s.local
I0121 21:24:32.801889   29495 create_cluster.go:1407] Using SSH public key: /Users/X/.ssh/id_rsa.pub
I0121 21:24:36.959846   29495 create_cluster.go:884] using google cloud project: x
Previewing changes that will be made:

I0121 21:24:46.759403   29495 apply_cluster.go:542] Gossip DNS: skipping DNS validation
W0121 21:24:46.805439   29495 external_access.go:36] TODO: Harmonize gcemodel ExternalAccessModelBuilder with awsmodel
W0121 21:24:46.805482   29495 firewall.go:35] TODO: Harmonize gcemodel with awsmodel for firewall - GCE model is way too open
W0121 21:24:46.805498   29495 firewall.go:63] Adding overlay network for X -> node rule - HACK
W0121 21:24:46.805504   29495 firewall.go:64] We should probably use subnets?
W0121 21:24:46.805531   29495 firewall.go:118] Adding overlay network for X -> master rule - HACK
W0121 21:24:46.969002   29495 storageacl.go:71] we need to split master / node roles
panic: runtime error: index out of range

goroutine 1 [running]:
k8s.io/kops/pkg/model/gcemodel.(*AutoscalingGroupModelBuilder).Build(0xc000de1480, 0xc000220120, 0x0, 0x0)
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/pkg/model/gcemodel/autoscalinggroup.go:173 +0x1912
k8s.io/kops/upup/pkg/fi/cloudup.(*Loader).BuildTasks(0xc000a2d580, 0x46473c0, 0xc0009ba890, 0xc000e06a70, 0x1, 0x1, 0xc0009f66c0, 0xc000cb25c0, 0xc000eed1d0, 0x14, ...)
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/upup/pkg/fi/cloudup/loader.go:179 +0x351
k8s.io/kops/upup/pkg/fi/cloudup.(*ApplyClusterCmd).Run(0xc0003cc000, 0x0, 0x0)
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/upup/pkg/fi/cloudup/apply_cluster.go:793 +0x18f4
main.RunUpdateCluster(0xc000a14300, 0x7ffeefbffac0, 0xe, 0x460b400, 0xc0000e0008, 0xc0007c82d0, 0x0, 0x27, 0x0)
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/cmd/kops/update_cluster.go:256 +0x7d6
main.RunCreateCluster(0xc000a14300, 0x460b400, 0xc0000e0008, 0xc000e0e700, 0x0, 0x0)
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/cmd/kops/create_cluster.go:1275 +0x33dd
main.NewCmdCreateCluster.func1(0xc00011a780, 0xc00085da40, 0x1, 0x14)
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/cmd/kops/create_cluster.go:264 +0x164
k8s.io/kops/vendor/github.com/spf13/cobra.(*Command).execute(0xc00011a780, 0xc00085d900, 0x14, 0x14, 0xc00011a780, 0xc00085d900)
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/vendor/github.com/spf13/cobra/command.go:760 +0x2cc
k8s.io/kops/vendor/github.com/spf13/cobra.(*Command).ExecuteC(0x6c40ba0, 0x3839400, 0x0, 0x0)
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/vendor/github.com/spf13/cobra/command.go:846 +0x2fd
k8s.io/kops/vendor/github.com/spf13/cobra.(*Command).Execute(0x6c40ba0, 0x6c77000, 0x0)
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/vendor/github.com/spf13/cobra/command.go:794 +0x2b
main.Execute()
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/cmd/kops/root.go:97 +0x87
main.main()
	/private/tmp/kops-20190102-83288-1naju7c/kops-1.11.0/src/k8s.io/kops/cmd/kops/main.go:25 +0x20
$ 

Please advise.