[v1.9.6] TypeError - OpenNumismat\SettingsDialog.py:401

OpenNumismat: 1.9.6
OS: Windows 11 (10.0.22621)
Python: 3.12.1 (64bit)
Qt: 6.6.1
Locale: en

Traceback (most recent call last):
File "OpenNumismat\SettingsDialog.py", line 815, in save
File "OpenNumismat\SettingsDialog.py", line 401, in save
TypeError: unsupported operand type(s) for : 'NoneType' and 'str'