regex not working for KeywordReplaceFilter

[joukgal]

hi, i want to ask, is regex not working for KeywordReplaceFilter ?

ERROR 2025-01-20 05:59:28,649 [mirroring.py:54]:telemirror: 'NoneType' object is not iterable
Traceback (most recent call last):
File "/home/juk/telemirror/telemirror/mirroring.py", line 52, in wrapper return await fn(self, *args, **kw)
File "/home/juk/telemirror/telemirror/mirroring.py", line 125, in new_message
proceed, filtered_message = await config.filters.process( File "/home/juk/telemirror/telemirror/messagefilters/base.py", line 29, in process
return await self._process_message(entity, event_type) File "/home/juk/telemirror/telemirror/messagefilters/messagefilters.py", line 438, in _process_message
filtered_text = self._lookup_regex.sub(repl, filtered_text) File "/home/juk/telemirror/telemirror/messagefilters/messagefilters.py", line 417, in repl
replacement = utils.add_surrogate(self._keywords_mapping.get(group.lower()))
File "/home/juk/telemirror/venv/lib/python3.10/site-packages/telethon/helpers.py", line 40, in add_surrogate
return ''.join(
TypeError: 'NoneType' object is not iterable

thank you!