[PyQt] pyqt4 segmentation fault

[Gioacchino]

hey all I am developing an application with pyqt, but from when we 
started to use PyQt4.QtSql we obtain segmentation fault after __init__ I 
add here an example:

print("creating SearchWindow")
self.myRicerca = SearchWindow()
print("SearchWindow created")

here is the SearchWindow() : http://pastebin.com/m73813f12

I obtain:
gioacchino at hackLab:~/Desktop/development/Mastro$ python main.py
Creating MainWindow
MainWindow created
creating SearchWindow
Segmentation fault

also with -v option i obtain: http://pastebin.com/mce5722f

and with gdb I obtain: http://pastebin.com/m11563502