Error when Branch Destroyer is on and Github Deletes branch first

[Spazzy757]

Describe the bug
When branch destroyer is on and automatically delete merged branches on github is on paul throws and error:

time="2021-04-30T16:13:31Z" level=error msg="webhook error occurred" error="DELETE https://api.github.com/repos/o/r/git/refs/heads/xxx: 422 Reference does not exist []"

To Reproduce
Turn on Githubs delete branch when merged
Turn on Pauls Branch Destroyer
Merge a Pull Request of a Branch

Expected behavior
Should not throw error (ignore error)

[Spazzy757]

/label bug