Chunklist panic with empty list

[melbit-michaelw]

Terraform Version

$ terraform version
Terraform v0.12.3

Terraform Configuration Files

I have a very large module which contains the following as part of an output:

chunklist(aws_subnet.public.*.id, length(var.azs))

Due to the size and content of the module I'm not able to share full code, but the problem appears easy to reproduce so that shouldn't be a problem.

In this instance, aws_subnet.public.*.id returns an empty list, and length(var.azs) returns 3.

I was also able to reproduce using the terraform console which is where the crash output is from:

$ terraform console
> chunklist([], 3)

>  
Error: Error in function call

Debug Output

Crash Output

https://gist.github.com/melbit-michaelw/c827a37598d144028c7d674f8021a66c

Expected Behavior

I expected it to return an empty list when the input was an empty list.

Actual Behavior

Crash. See crash log.

Steps to Reproduce

Easiest method is the terraform console example above.

Additional Context

References

This looks similar to #21403

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.