[v1.8.18] TypeError - OpenNumismat\Collection\Collection.py:1134

OpenNumismat: 1.8.18
OS: Windows 10 (10.0.19045)
Python: 3.10.9 (64bit)
Qt: 5.15.7
Locale: en

Traceback (most recent call last):
File "OpenNumismat\MainWindow.py", line 773, in newCollectionEvent
File "OpenNumismat\MainWindow.py", line 837, in __closeCollection
File "OpenNumismat\MainWindow.py", line 874, in __saveParams
File "OpenNumismat\Collection\Collection.py", line 1134, in isNeedBackup
TypeError: '