#0  0xb718e822 in g_type_check_instance_cast ()
   from /usr/lib/libgobject-2.0.so.0
#1  0x08065c5b in ?? ()
#2  0x116d7548 in ?? ()
#3  0x08112230 in ?? ()
#4  0xb400bec3 in ?? ()
#5  0x08065c3c in ?? ()
#6  0x080f6210 in ?? ()
#7  0x00000000 in ?? ()