Setting will cause moblin-media abnormally exit

while slide showing photos, setting dialog will cause media player exit.

it prints error :
  Warning: g_object_ref:assertion 'object->ref_count > 0' failed
 Gtk.main()
 Segmentation fault
sometimes it prints :
     AttributeError: Setting instance has no attribute 'cur_mode'
    Segmentation fault

steps:
 1.launch photo mode
 2.switch to slide show mode and start slide show photos
 3.click top-level menu -> Setting while slide showing
 4.modify some values
 5.click OK button. then you will see that can't close button with OK button or Cancel button
 6.press Esc key to exit setting dialog
 7.then moblin-media will abnormally terminate.

note: sometime need repeat step 3~6 to cause it reproduce.