[v1.8.5] KeyError - OpenNumismat/ListView.py:551

OpenNumismat: 1.8.5
OS: Darwin 19.4.0 (Darwin Kernel Version 19.4.0: Wed Mar 4 22:28:40 PST 2020; root:xnu-6153.101.6~15/RELEASE_X86_64)
Python: 3.6.4 (64bit)
Qt: 5.9.2
Locale: en

Traceback (most recent call last):
File "OpenNumismat/ListView.py", line 551, in lessThan
KeyError: 'Owned'