Comment 2 for bug 1264643

StacktraceTop:
 _args_cache_generate (callable_cache=0x12c5f60, callable_info=0x11789e0) at ../../gi/pygi-cache.c:999
 _pygi_callable_cache_new (callable_info=0x11789e0, is_ccallback=is_ccallback@entry=0) at ../../gi/pygi-cache.c:1198
 _wrap_g_callable_info_invoke (self=0x7f9b948a16c0, py_args=py_args@entry=0x7f9b9851c090, kwargs=kwargs@entry=0x0) at ../../gi/pygi-invoke.c:670
 _callable_info_call (self=0x7f9b9850f9d0, args=0x7f9b9856a050, kwargs=0x0) at ../../gi/pygi-info.c:428
 PyObject_Call (kw=0x0, arg=0x7f9b9856a050, func=<optimized out>) at ../Objects/abstract.c:2064