Comment 1 for bug 1612187

        if not is_valid:
            text = translate('OpenLP.ShortcutListDialog',
                             'The shortcut "{key}" is already assigned to another action, please'
                             ' use a different shortcut.'
                             ).format(key=self.get_shortcut_string(key_sequence))
            self.main_window.warning_message(translate('OpenLP.ShortcutListDialog', 'Duplicate Shortcut'),
                                             text, for_display=True) <<<< THIS = TRACEBACK
            self.dialog_was_shown = True
        return is_valid

        if not is_valid:
            text = translate('OpenLP.ShortcutListDialog',
                             'The shortcut "{key}" is already assigned to another action, please'
                             ' use a different shortcut.'
                             ).format(key=self.get_shortcut_string(key_sequence))
            self.main_window.warning_message(translate('OpenLP.ShortcutListDialog', 'Duplicate Shortcut'),
                                             text)
            for_display = True < FIX?
            self.dialog_was_shown = True
        return is_valid