Traceback (most recent call last):
File "lib/doodleDelegate.pyc", line 89, in sendEvent_
File "/Applications/RoboFont-4_4p.app/Contents/Resources/lib/python3.9/vanilla/vanillaList.py", line 54, in observeValueForKeyPath_ofObject_change_context_
File "/Applications/RoboFont-4_4p.app/Contents/Resources/lib/python3.9/vanilla/vanillaList.py", line 767, in _edit
File "/Users/Ryan/Library/Application Support/RoboFont/plugins/DesignspaceEditor2.roboFontExt/lib/designspaceEditor/ui.py", line 1136, in instancesListEditCallback
File "/Users/Ryan/Library/Application Support/RoboFont/plugins/DesignspaceEditor2.roboFontExt/lib/designspaceEditor/ui.py", line 1059, in unwrapInstanceDescriptor
File "objc/_convenience_mapping.pyc", line 18, in __getitem__objectForKey_
File "objc/_convenience.pyc", line 134, in container_unwrap
KeyError: 'instancePostscriptFontName'
UI freezes as well
May be related to #67