Traceback (most recent call last):
  File "/usr/bin/mate-tweak", line 1020, in combo_fallback
    self.additional_tweaks(schema, key, value[1])
  File "/usr/bin/mate-tweak", line 991, in additional_tweaks
    if not self.confirm_dialog(title, text):
  File "/usr/bin/mate-tweak", line 747, in confirm_dialog
    return confirmed
UnboundLocalError: local variable 'confirmed' referenced before assignment