The cypher statement query is faulty

[noobexplore]

The following code is:

cypher sql ="match (n)-[r]->(m) return r" or "match p=(n)-[r]->(m) return p"
for x in StellarDataConvert.bind_output(db.execute(sql)):
print(x)

debug info
python-BaseException
return Edge.parseEdgeFromDict(schema, m)
File "/home/xtl/anaconda3/envs/kbqapop/lib/python3.7/site-packages/pystellardb/graph_types.py", line 183, in parseEdgeFromDict
startUid = Vertex.parseUidFromRK(m['startKey'])
File "/home/xtl/anaconda3/envs/kbqapop/lib/python3.7/site-packages/pystellardb/graph_types.py", line 103, in parseUidFromRK
return ''.join([chr(x) for x in rk[:-2]])
File "/home/xtl/anaconda3/envs/kbqapop/lib/python3.7/site-packages/pystellardb/graph_types.py", line 103, in
return ''.join([chr(x) for x in rk[:-2]])
ValueError: chr() arg not in range(0x110000)

What's wrong? how can i fix it