[v1.8.9] TypeError - OpenNumismat\Collection\Collection.py:1118

OpenNumismat: 1.8.9
OS: Windows 10 (10.0.18362)
Python: 3.4.4 (32bit)
Qt: 5.5.1
Locale: de

Traceback (most recent call last):
File "OpenNumismat\MainWindow.py", line 826, in closeEvent
File "OpenNumismat\MainWindow.py", line 829, in __shutDown
File "OpenNumismat\MainWindow.py", line 849, in __saveParams
File "OpenNumismat\Collection\Collection.py", line 1118, in isNeedBackup
TypeError: unorderable types: NoneType() < int()