[v1.6.9] AttributeError - d:\OpenNumismat\open-numismat\OpenNumismat\Reference\Reference.py:464

OpenNumismat: 1.6.9
OS: Windows 10 (10.0.16299)
Python: 3.4.4 (32bit)
Qt: 5.5.1
Locale: de

Traceback (most recent call last):
File "d:\OpenNumismat\open-numismat\OpenNumismat\MainWindow.py", line 626, in newCollectionEvent
File "d:\OpenNumismat\open-numismat\OpenNumismat\Tools\CursorDecorators.py", line 11, in wrapper
File "d:\OpenNumismat\open-numismat\OpenNumismat\MainWindow.py", line 661, in setCollection
File "d:\OpenNumismat\open-numismat\OpenNumismat\Collection\Collection.py", line 685, in loadReference
File "d:\OpenNumismat\open-numismat\OpenNumismat\Reference\Reference.py", line 407, in load
File "d:\OpenNumismat\open-numismat\OpenNumismat\Reference\Reference.py", line 472, in __updateTo1
File "d:\OpenNumismat\open-numismat\OpenNumismat\Reference\Reference.py", line 464, in backup
AttributeError: 'Reference' object has no attribute 'fileName'