323 static PyObject *
324 urj_pyc_get_frequency (urj_pychain_t *self, PyObject *args)
325 {
326     urj_chain_t *urc = self->urchain;
327     unsigned long freq;
328     if (!urj_pyc_precheck (urc, UPRC_CBL))
when considering value == (int)0 from chain.c:328
taking True path
329         return NULL;
330 
331     freq = urj_tap_cable_get_frequency (urc->cable);
332 
333     return Py_BuildValue ("i", (uint32_t) freq);
334 }
returning (PyObject*)NULL without setting an exception