[apport] serpentine crashed with AssertionError in _get_progress() so says apport, but the application is still running

Binary package hint: serpentine

I do not know if the bug is on apport or on serpentine but here is what happened.
I wanted to burn some MP3 to an audio CD, so I launched Serpentine and added the required MP3 files (and I still had 11 minutes of free space). Then, I inserted a blank CD, and said "Ignore" because Ubuntu was proposing me to build an audio or data CD.
I then pressed burn. Serpentine was presenting a progress dialogue where it was indicating that it was preparing the media files or so. At that point the apport application was triggered telling me that Serpentine crashed, time I went through the few screens of apport, I could hear that Serpentine was starting burning. So I went checking the progress dialogue, it was correctly showing the progress of the burning...
I decided to wait until the process is finished. The process finished successfully, Serpentine is still working, my audio CD seems to work perfectly (I'm listening to it at the moment).
So I still clicked on send a report from apport, because it seems that there is a problem in apport... Or at least that is my point of view because Serpentine is still 100% functional.

ProblemType: Crash
Architecture: i386
Date: Sun Mar 25 19:38:33 2007
DistroRelease: Ubuntu 7.04
ExecutablePath: /usr/bin/serpentine
InterpreterPath: /usr/bin/python2.5
Package: serpentine 0.7-4ubuntu3
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/serpentine -o
ProcCwd: /home/jean-christophe
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/usr/games
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/serpentine']
SourcePackage: serpentine
Uname: Linux L0514 2.6.20-12-generic #2 SMP Wed Mar 21 20:55:46 UTC 2007 i686 GNU/Linux