Debug of PyQt app causes crash

We are using PyCharm 4.0.4, PyQt 5.3.2 and Python 3.4 to develop a GUI application. If we put a breakpoint in a method of a class the derives from QWidget, and run the app and the breakpoint gets hit, if we click on the + to expand the self representing the QWidget derived class instance, then the application being debugged crashes. PyCharm is ok. We can do other debug ops without problem, like step over, in, out. Even variables and calls on their methods that cause crash in Variables window work fine in the Watch window.

This crash does not happen when the breakpoint is in non-PyQt components of the same application.

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