Custom Image not working

[mls3000]

When providing the argument --icon-file „Example.png“, the script will return the following error (full output shown):

Downloading munkitools from https://github.com/munki/munki/releases/download/v6.3.1/munkitools-6.3.1.4580.pkg...
Replacing app name with FooBar...
Traceback (most recent call last):
  File "/Users/user/Downloads/munki-rebrand-5.2/munki_rebrand.py", line 632, in <module>
    main()
  File "/Users/user/Downloads/munki-rebrand-5.2/munki_rebrand.py", line 512, in main
    if icns:
UnboundLocalError: local variable 'icns' referenced before assignment
Cleaning up...
Done.

This happens irrespective of the image file provided, or the location the script is being run from. Running the script without the image argument works just fine.

macOS 12.6.6