handle null result

Author: fangnx

src/confluent_kafka/src/Admin.c

@@ -4536,7 +4536,16 @@ static PyObject * Admin_c_SingleGroupResult_to_py(const rd_kafka_group_result_t
 
  kwargs = PyDict_New();
 
- cfl_PyDict_SetString(kwargs, "group_id", rd_kafka_group_result_name(c_group_result_response));
+ /* Safely handle potential NULL group name from librdkafka */
+ const char *group_name = rd_kafka_group_result_name(c_group_result_response);
+ if (!group_name) {
+ cfl_PyErr_Format(RD_KAFKA_RESP_ERR__INVALID_ARG,
+ "Received NULL group name from librdkafka");
+ Py_DECREF(kwargs);
+ Py_DECREF(GroupResult_type);
+ return NULL;
+ }
+ cfl_PyDict_SetString(kwargs, "group_id", group_name);
 
  c_topic_partition_offset_list = rd_kafka_group_result_partitions(c_group_result_response);
  if(c_topic_partition_offset_list) {