rem: if ( text().length() == 2 && !event->text().isNull() )
add: if ( text().length() == 2 && !event->text().isEmpty() )
context: 	virtual void keyPressEvent( QKeyEvent *event ) {		QLineEdit::keyPressEvent( event );		if ( text().length() == 2 && !event->text().isNull() ) 			focusNextPrevChild(true);	}