672 static PyObject *
673 urj_pyc_setpart (urj_pychain_t *self, PyObject *args)
674 {
675     urj_chain_t *urc = self->urchain;
676     int part;
677     if (!PyArg_ParseTuple (args, "i", &part))
when PyArg_ParseTuple() succeeds
taking False path
678         return NULL;
679     if (!urj_pyc_precheck (urc, UPRC_CBL|UPRC_DET))
when considering value == (int)0 from chain.c:679
taking True path
680         return NULL;
681 
682     urc->active_part = part;
683     return Py_BuildValue ("");
684 }
returning (PyObject*)NULL without setting an exception