173 static PyObject *
174 urj_pyc_disconnect (urj_pychain_t *self)
175 {
176     urj_chain_t *urc = self->urchain;
177     if (!urj_pyc_precheck (urc, 0))
when considering value == (int)0 from chain.c:177
taking True path
178         return NULL;
179     urj_tap_chain_disconnect (urc);
180     return Py_BuildValue ("");
181 }
returning (PyObject*)NULL without setting an exception