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We've hit something similar to this recently. Let me pull up the bug...

<https://github.com/pulumi/pulumi-terraform/issues/211>

That might make sense, I do have a security group array…

Almost certainly that’s the issue. Just went out to dinner, will try to repro when I get back

Got to the bottom of this one in terms of what was causing it in my program. It’s a legit bug in my code causing `undefined` as an array item being passed to `vpcSecurityGroupIds` on an `aws.ec2.Instance`, but I don’t think it should panic in this case