abrt version: 1.1.14
architecture: x86_64
cmdline: python /usr/bin/pitivi
component: pitivi
executable: /usr/bin/pitivi
kernel: 2.6.36.2-12.rc1.fc15.x86_64
package: pitivi-0.13.5-3.fc14
reason: track.py:224:removeKeyframe:ValueError: list.remove(x): x not in list
release: Fedora release 14 (Laughlin)
How to reproduce: 1. Used undo to remove a keyframe from the timeline
time: 1292504625
uid: 500

backtrace
-----
track.py:224:removeKeyframe:ValueError: list.remove(x): x not in list

Traceback (most recent call last):
  File "/usr/share/pitivi/python/pitivi/ui/mainwindow.py", line 651, in _undoCb
    self.app.action_log.undo()
  File "/usr/share/pitivi/python/pitivi/undo.py", line 165, in undo
    self._runStack(stack, stack.undo)
  File "/usr/share/pitivi/python/pitivi/undo.py", line 205, in _runStack
    run()
  File "/usr/share/pitivi/python/pitivi/undo.py", line 80, in undo
    self._runAction(self.done_actions, "undo")
  File "/usr/share/pitivi/python/pitivi/undo.py", line 72, in _runAction
    method()
  File "/usr/share/pitivi/python/pitivi/timeline/timeline_undo.py", line 165, in undo
    self.track_object.removeKeyframe(self.keyframe)
  File "/usr/share/pitivi/python/pitivi/timeline/track.py", line 224, in removeKeyframe
    self._keyframes.remove(keyframe)
ValueError: list.remove(x): x not in list

Local variables in innermost frame:
keyframe: <pitivi.timeline.track.Keyframe object at 0x7f64d8144e50>
self: <pitivi.timeline.track.Interpolator object at 0x2d5a9d0>
old_value: 0.997178908816207