G4: Command+D opens dozen error windows

[sebsan (Sebastien Sanfilippo)]

Has happened a few times

4.1 (4102)

[SCarewe (Sebastian Carewe)]

Looks like it’s related: G4 Add Glyphs bug

[GeorgSeifert]

and G4: Adding Unicode to a glyph with a saved custom category triggers sidebar errors

[GeorgSeifert]

Fixed it.