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Can someone tell me how to fix it? @Fox
Solution for those who need it: a custom module was created, uninstall it and reinstall it
I 've just realized that this happened on invalid emails. Problem solved!
I've tried the same thing as you and for me it's working in RUN mode. Have you managed to make it work?
@adam66688 http://wiki.bablosoft.com/doku.php?id=how_to_set_combobox