Set style "Fusion" stop program with SIGSEGV

The code only setting style Fusion generates SIGSEGV:
=============================================================
void Widget_Options::SlotStyleChanged(int iIdx)
{
if (iIdx == 0) QApplication::setStyle(QStyleFactory::create("WindowsXP"));
if (iIdx == 1) QApplication::setStyle(QStyleFactory::create("Windows"));
if (iIdx == 2) QApplication::setStyle(QStyleFactory::create("Fusion"));
}
=============================================================
The error is not constant. Very strange.
Small project is attached.

QT 5.0.1 / MinGW 47_32bit