[PyQt] QMutex::lock: mutex lock failure:

[tabish-->]

what is this error  QMutex::lock: mutex lock failure: 
and how to solve it.

i made Qtabwidget where tabs can be swapped between different tabwidgets.
when i swap tabs from one tabwidget to another after few swaps this error is
displayed and my application crashes.
why this error?
please help.
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