[PyQt] core dump in pyqt application

[Iván García]

One of my users just reported this bug:

ASSERT failure in QCoreApplication::sendEvent: "Cannot send events to objects owned by a different thread. Current thread f74470. Receiver 'MainWindow' (of type 'QMainWindow') was created in thread 9a7fc0", file kernel/qcoreapplication.cpp, line 269
Cancelado (core dumped)

How to avoid this problem? Is there a way to fix the problem within the 
application code?

Thanks in advance.
Ivan.