#0  0xb71a7319 in g_type_check_instance_is_a ()
   from /usr/lib/libgobject-2.0.so.0
#1  0xb718e9b6 in g_object_unref () from /usr/lib/libgobject-2.0.so.0
#2  0x0805be7c in ?? ()
#3  0xb6e1a178 in ?? () from /lib/tls/i686/cmov/libc.so.6
#4  0x00000018 in ?? ()
#5  0x00000000 in ?? ()