0xb73537b1 in g_object_unref () from /usr/lib/libgobject-2.0.so.0
(gdb) bt
#0  0xb73537b1 in g_object_unref () from /usr/lib/libgobject-2.0.so.0
#1  0xb7ef58bc in tp_group_finalize (object=0x8245cc0)
    at empathy-tp-group.c:460
#2  0xb73538fb in g_object_unref () from /usr/lib/libgobject-2.0.so.0
#3  0xb737373c in g_value_unset () from /usr/lib/libgobject-2.0.so.0
#4  0xb7367a94 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#5  0xb7367da9 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#6  0xb7ef4ddb in tp_group_destroy_cb (tp_chan=0x81de648, group=0x8245cc0)
    at empathy-tp-group.c:315
#7  0xb735e95f in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
#8  0xb7e96516 in ?? () from /usr/lib/libdbus-glib-1.so.2
#9  0x082472d0 in ?? ()
#10 0x00000000 in ?? ()