Crash in gnome-shell

[Xavier Claessens]

backtrace:

#0 0x00007fffee692623 in cogl_object_unref ()
   from /usr/lib/x86_64-linux-gnu/libcogl.so.9
#1 0x00007fffee69121f in ?? () from /usr/lib/x86_64-linux-gnu/libcogl.so.9
#2 0x00007fffee690ca5 in cogl_renderer_check_onscreen_template ()
   from /usr/lib/x86_64-linux-gnu/libcogl.so.9
#3 0x00007ffff6d2116d in clutter_backend_x11_get_display (
    backend=<optimized out>, renderer=0x7851f0, swap_chain=0x77e060,
    error=0x7fffffffdbc8) at ./x11/clutter-backend-x11.c:726
#4 0x00007ffff6d4f279 in clutter_backend_real_create_context (
    error=0x7fffffffdc50, backend=0x619080) at ./clutter-backend.c:290
#5 clutter_backend_real_create_context (backend=0x619080,
    error=0x7fffffffdc50) at ./clutter-backend.c:248
#6 0x00007ffff6d664a6 in _clutter_feature_init (error=0x7fffffffdc50)
    at ./clutter-feature.c:107
#7 0x00007ffff6d71a4a in clutter_init_real (error=0x7fffffffdc50)
    at ./clutter-main.c:1572
#8 0x00007ffff6d71f60 in clutter_init (argc=0x0, argv=0x0)
    at ./clutter-main.c:2093
#9 0x00007ffff78c99b6 in meta_init () from /usr/lib/libmutter.so.0
#10 0x0000000000402230 in main ()