IndexError: tuple index out of range

[zhangzhen999]

while decoding,the error logs are displayed:
.......
INFO:tensorflow:Finished batch 312
INFO:tensorflow:Finished batch 313
Traceback (most recent call last):
File "translator.py", line 370, in
main(parse_args())
File "translator.py", line 333, in main
for item in shard[1]:
IndexError: tuple index out of range

[Glaceon31]

Would you provide the detailed setting? That will help us reproduce this error.