abrt 1.0.7 detected a crash.

architecture: x86_64
cmdline: /usr/bin/python /usr/bin/gpodder
comment: Just tried to add http://www.npr.org/rss/podcast.php?id=510253
component: gpodder
executable: /usr/bin/gpodder
kernel: 2.6.32.8-58.fc12.x86_64
package: gpodder-2.1-2.fc12
reason: gui.py:1740:play_or_download:TypeError: unknown type (null)
release: Fedora release 12 (Constantine)

backtrace
-----
gui.py:1740:play_or_download:TypeError: unknown type (null)

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/gpodder/gui.py", line 702, in <lambda>
    selection.connect('changed', lambda s: self.play_or_download())
  File "/usr/lib/python2.6/site-packages/gpodder/gui.py", line 1740, in play_or_download
    episode = model.get_value(model.get_iter(path), EpisodeListModel.C_EPISODE)
TypeError: unknown type (null)

Local variables in innermost frame:
paths: [(0,), (1,), (2,), (3,), (4,), (5,), (6,), (7,), (8,)]
selection: <gtk.TreeSelection object at 0x7f6840b35820 (GtkTreeSelection at 0x20740c0)>
can_delete: False
is_locked: False
self: <gpodder.gui.gPodder at /gui at 0x1f709d0>
can_download: False
can_play: False
can_cancel: False
open_instead_of_play: False
can_transfer: False
path: (0,)
model: <gtk.TreeModelFilter object at 0x1f92af0 (GtkTreeModelFilter at 0x20a06e0)>
is_played: False

How to reproduce
-----
1. Tried to add http://www.npr.org/rss/podcast.php?id=510253
2.
3.