Here is the link for the bug report :
https://bugzilla.gnome.org/show_bug.cgi?id=688845
And shame on me to answer it to a bot :p
Thanks for your answer !
** Bug watch added: GNOME Bug Tracker #688845
https://bugzilla.gnome.org/show_bug.cgi?id=688845
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Janitor, on ArchLinux there is the same problem now and your patch fix
the crashes.
I have opened a bug report on the gnome bugzilla before I found your
patch, and now I know it fix the problem I would like to have the bug
number of this bug of GConf please, a banshee developer needs it.
Thanks