[v1.8.11] AttributeError - OpenNumismat\EditCoinDialog\ImageLabel.py:386

OpenNumismat: 1.8.11
OS: Windows 10 (10.0.19041)
Python: 3.4.4 (32bit)
Qt: 5.5.1
Locale: de

Traceback (most recent call last):
File "OpenNumismat\EditCoinDialog\ImageLabel.py", line 293, in pasteImage
File "OpenNumismat\EditCoinDialog\ImageLabel.py", line 386, in _setNewImage
AttributeError: 'NoneType' object has no attribute 'hasAlphaChannel'