uncaught exeption takes down app

does NOT happen on windows

Minimum compileable example:

1. Load the "Combo Widget Mapper" example project
2. in file "window.cpp" after line 73, add this: typeComboBox->setEditable(true); 
3. run
4. click the "Type" combo box to drop the box down
5. use ARROW KEY to move selection to new menu item
6. press RETURN/ENTER key to enter it
7. <--- exception is thrown here