[v1.6.8] AttributeError - d:\OpenNumismat\open-numismat\OpenNumismat\Collection\HeaderFilterMenu.py:256

OpenNumismat: 1.6.8
OS: Windows 7 (6.1.7601)
Python: 3.4.4 (32bit)
Qt: 5.5.1
Locale: ru

Traceback (most recent call last):
File "d:\OpenNumismat\open-numismat\OpenNumismat\Collection\HeaderFilterMenu.py", line 251, in prepareMenu
File "d:\OpenNumismat\open-numismat\OpenNumismat\Collection\HeaderFilterMenu.py", line 256, in itemChanged
AttributeError: 'NoneType' object has no attribute 'type'