[digiKam-users] deleting number of tags

[backgroundemailaddress at tutanota.com]

I'd like to delete a whole number of unused tags, but after the confirmation dialogue comes another dialogue. The list with tags is that long however, that I can't see what digiKam is actually asking. If I just press enter, it seems the operation is cancelled. If I press tab and after that enter, digiKam crashes. Does anybody knows how to delete a whole number of unused tags and what that extra dialogue is asking?

Many thanks!