[v1.9.1] AttributeError - OpenNumismat\CustomizeTreeDialog.py:22

OpenNumismat: 1.9.1
OS: Windows 10 (10.0.22621)
Python: 3.11.3 (64bit)
Qt: 6.5.0
Locale: en

Traceback (most recent call last):
File "OpenNumismat\CustomizeTreeDialog.py", line 40, in rowsRemoved
File "OpenNumismat\CustomizeTreeDialog.py", line 22, in updateFlags
AttributeError: 'NoneType' object has no attribute 'childCount'