I am a bit frustrated with seg faults.

I have the following main
Qt Code: 
  1. int main(int argc, char *argv[])
  2. {
  3.       bool connection;
  4.  
  5.  
  6.       QApplication app(argc, argv);
  7.  
  8. 	if (!createConnection())
  9. 	    connection = false;
  10.  
  11. 	else
  12. 	    connection = true;
  13.       	qDebug()<<"connection: "<<connection;
  14. 	mainWindow start(connection,0);
  15. 	start.show();
  16.       return app.exec();
  17. }
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and the connection.h is

Qt Code: 
  1. inline bool createConnection() 
  2. {
  3. 	QSqlDatabase  db =  QSqlDatabase::addDatabase("QSQLITE");
  4. 	db.setDatabaseName("ppl.db");
  5. 	if (!db.open()) {	
  6. 		QMessageBox::critical(0,QObject::tr("Non riesco a connettermi al database. Controlla il nome o verifica che il file sia presente"),db.lastError().text());
  7. 		return false;
  8. 	}
  9. 	return true;
  10. }
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Now, in mainWindow.cpp I have a QTableView tied with a database:

Qt Code: 
  1. QSqlQueryModel  *model = new QSqlQueryModel(this);
  2. 	model->setQuery("SELECT * FROM persone");
  3. ...
  4. QTableView *listTable    = new QTableView(this);
  5. 	listTable->setShowGrid(false);
  6. 	listTable->setModel(model);
  7. ...
  8. connect(listTable,SIGNAL(clicked(const QModelIndex &)),this,SLOT(updateDetails(const QModelIndex &)));
  9. }
  10.  
  11. void mainWindow::updateDetails(const QModelIndex &selection)
  12. {
  13. 	/* Get the selected indexes in the TableView*/
  14.  	if (selection.isValid()) {
  15. 	qDebug() << selection.row();
  16.   	QSqlRecord rec = model->record(0);
  17.  
  18. // 	QString temp = record.value("nome").toString();
  19. 	}
  20.  
  21. }
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The compilation is good, but when i click on the first row of the Table a seg fault is fired.
Any help?
Attached is an excerpt of the gdb output:

Qt Code: 
  1. \#0  QSqlRecord (this=0xbf8a4388, other=@0x16d45a8) at ../../include/QtCore/../../src/corelib/arch/qatomic_i386.h:122
  2. \#1  0x0082d40c in QSqlQueryModel::record (this=0xbf8a54d8, row=0) at models/qsqlquerymodel.cpp:481
  3. \#2  0x0804b726 in mainWindow::updateDetails ()
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