Dapr workflow fails while purging retryable child workflows

[shivamkm07]

In what area(s)?

/area runtime

/area operator

/area placement

/area docs

/area test-and-release

What version of Dapr?

1.1.x
1.0.x
edge: output of git describe --dirty

Expected Behavior

Dapr workflow should be able to purge child workflows successfully without any errors.

Actual Behavior

On trying to purge a workflow, which creates retryable child workflows, Dapr errors out with Segmentation fault:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x4f40a58]

Steps to Reproduce the Problem

Run the following example with latest dapr master : https://github.com/dapr/python-sdk/blob/main/examples/demo_workflow/README.md

It should error out with aforementioned error.

Release Note

RELEASE NOTE: FIX Bug in runtime.