Comment 2 for bug 735918

StacktraceTop:
 ?? ()
 brasero_volume_get_gvolume (volume=<value optimized out>) at brasero-volume.c:103
 brasero_volume_get_mount_point (volume=<value optimized out>, error=0x0) at brasero-volume.c:175
 brasero_volume_is_mounted (volume=0x1fb8370) at brasero-volume.c:141
 brasero_burn_unmount (self=0x23ae500, medium=0x1fb8370, error=0x7fff73094e38) at brasero-burn.c:319