Issue with new NZBGez 21.1

Hi,

I got following error in NZBget 21.1:


FakeDetector: AttributeError: 'NoneType' object has no attribute 'replace'
FakeDetector: bannedMediaExtensions = os.environ.get('NZBPO_BANNEDEXTENSIONS').replace(' ', '').split(',')
FakeDetector: File "/downloads/scripts/FakeDetector.py", line 96, in <module>
FakeDetector: Traceback (most recent call last):

How can i fix that?