#0  0x00000000004fcf2b in do_warn.29084 ()
#1  0x00000000004fd4fb in PyErr_WarnEx ()
#2  0x00007f0cecd00284 in _log_func (log_domain=<optimized out>, log_level=G_LOG_LEVEL_CRITICAL, message=0x13eec80 "g_object_unref: assertion `G_IS_OBJECT (object)' failed", user_data=0xf7a8e0) at /build/buildd/pygobject-2-2.28.6/gobject/gobjectmodule.c:2353
  [Error: /build/buildd/pygobject-2-2.28.6/gobject/gobjectmodule.c was not found in source tree]
#3  0x00007f0cf237dfa1 in ?? ()
#4  0x00000000013eec80 in ?? ()
#5  0x0000000800000000 in ?? ()
#6  0x0000000000000001 in ?? ()
#7  0x0000000000000000 in ?? ()