Bluetooth Scanner Example crashes

Steps to reproduce the crash:

• turn off wireless radio so that no device is discovered
• run the application and right click (a couple of times) on the list widget on the application: the application crashes.

This because of this code fragment:
QListWidgetItem *currentItem = ui->list->currentItem();
QString text = currentItem->text();

in function displayPairingMenu(const QPoint &pos)
not checking if the list has elements (none in my case) or currentItem is null.