abrt 1.1.0 detected a crash.

architecture: i686
cmdline: /usr/bin/python /usr/bin/gpodder
component: gpodder
executable: /usr/bin/gpodder
kernel: 2.6.33.5-112.fc13.i686
package: gpodder-2.5-1.fc13
reason: model.py:708:update_by_iter:TypeError: unknown type (null)
release: Fedora release 13 (Goddard)

backtrace
-----
model.py:708:update_by_iter:TypeError: unknown type (null)

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/gpodder/gui.py", line 1856, in <lambda>
    item.connect( 'activate', lambda w: self.on_item_toggle_played_activate( w, False, True))
  File "/usr/lib/python2.6/site-packages/gpodder/gui.py", line 2854, in on_item_toggle_played_activate
    self.on_selected_episodes_status_changed()
  File "/usr/lib/python2.6/site-packages/gpodder/gui.py", line 2835, in on_selected_episodes_status_changed
    self.update_podcast_list_model(selected=True)
  File "/usr/lib/python2.6/site-packages/gpodder/gui.py", line 2177, in update_podcast_list_model
    self.podcast_list_model.update_by_filter_iter(iter)
  File "/usr/lib/python2.6/site-packages/gpodder/gtkui/model.py", line 700, in update_by_filter_iter
    self.update_by_iter(self._filter.convert_iter_to_child_iter(iter))
  File "/usr/lib/python2.6/site-packages/gpodder/gtkui/model.py", line 708, in update_by_iter
    channel = self.get_value(iter, self.C_CHANNEL)
TypeError: unknown type (null)

Local variables in innermost frame:
self: <PodcastListModel object at 0x99a1c5c (GtkListStore at 0x9a541c8)>
iter: <GtkTreeIter at 0xb190a3c0>

How to reproduce
-----
1. Marked a podcast episode as old and then it crashed
2.
3.