Yeah, it's a qapt bug, that I think I fixed for the next release. Alas,
not quite sure when we are going to do the next release

quick back story:
to prevent the UI from blocking qapt started eventloop processing inside 
itself, which is sort of like multithreading except it's inside the same thread 
thus less prone to threading issues. however even without multiple threads it 
caues issues when an application is not prepared for this sort of behavior. in 
particular in the bug at hand due to the unblocked UI you were able to cause 
the quit signal (by closing the app) which caused a destruction while in fact 
the application was still constructing which is why it exploded. anyway, long 
story short we decided that this was nasty behavior and removed the unblocking 
which still seems to give resonable fast experience regardless.

** Package changed: kde-runtime (Ubuntu) => qapt (Ubuntu)

** Changed in: qapt (Ubuntu)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1270571

Title:
  Systemsettings crash when interrupting kcm-language at loading

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