exception when read binary json type inlined

I'm using mysql-replication==0.18. I got exception with binary json type. I don't know how to fix it?
It is a terrible problem. Because everyday, our system transfers million messages using mysql-replication library. Could you help to figure out the problem? Please!

```
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/row_event.py", line 429, in rows
self._fetch_rows()
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/row_event.py", line 424, in _fetch_rows
self.__rows.append(self._fetch_one_row())
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/row_event.py", line 477, in _fetch_one_row
row["values"] = self._read_column_data(self.columns_present_bitmap)
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/row_event.py", line 181, in _read_column_data
values[name] = self.packet.read_binary_json(column.length_size)
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/packet.py", line 352, in read_binary_json
return self.read_binary_json_type(t, length)
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/packet.py", line 357, in read_binary_json_type
return self.read_binary_json_object(length - 1, large)
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/packet.py", line 440, in read_binary_json_object
data = self.read_binary_json_type(t, length)
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/packet.py", line 357, in read_binary_json_type
return self.read_binary_json_object(length - 1, large)
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/packet.py", line 430, in read_binary_json_object
for _ in range(elements)]
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/packet.py", line 430, in
for _ in range(elements)]
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/packet.py", line 46, in read_offset_or_inline
return (t, None, packet.read_binary_json_type_inlined(t))
File "/tiki/apollo-event-publisher/virtualenv/lib64/python3.6/site-packages/pymysqlreplication/packet.py", line 405, in read_binary_json_type_inlined
raise ValueError('Json type %d is not handled' % t)
ValueError: Json type 4 is not handled
```