https://bugs.winehq.org/show_bug.cgi?id=37910
--- Comment #1 from Maarten anonymous.maarten@gmail.com --- Just found out that some other commands in the menus also cause these empty error dialogs to show up.
e.g. Bestand-> AusWahlen Bestand-> Loschen Kartei-> Karteiblatter pflegen Mitglieder -> Angerungsdienst -> Mitglieder pflegen
The last command event makes the program to go unresponsive (infinite loop).