Crash on OpenFile dialog (C++, QML, cmake, Windows, Visual Studio 2012 64 bits)

The executable crashes when the dialog is closed. It doesn't matter if user clicked open, cancel or selected a file with double clic. It happens 1/25 times in release mode (approximately) and 1/5 times in debug (approximately).
It sometimes give the attached stack (stack.txt). Sometimes not.

To test it: there is a button in the lower corner of the screen. Click it to open the dialog. The button is not visible, but it doesn't matter. Note that code is copy-pasted from the main project in which we discovered the supposed bug. If it's necessary we can try to narrow it even more.

Project can be downloaded from: https://github.com/GdelP/qt51crashonfiledialog