Illegal division by zero at /My-path-to-RELEASE-1.5.5/ROUGE-1.5.5.pl line 2450.

I was training by chinese weibo data ,but when running decode.py,it failed to calculate rouge score .This is the issue which have the same problem but still remain to be sovled.
https://github.com/andersjo/pyrouge/issues/5

> Decoder has finished reading dataset for single_pass.
Now starting ROUGE eval...
Illegal division by zero at /usr/local/ROUGE-1.5.5/ROUGE-1.5.5.pl line 2450.
Traceback (most recent call last):
File "training_ptr_gen/decode.py", line 208, in
beam_Search_processor.decode()
File "training_ptr_gen/decode.py", line 106, in decode
results_dict = rouge_eval(self._rouge_ref_dir, self._rouge_dec_dir)
File "/mnt/jml/nlp/summarize/pointer_summarizer/data_util/utils.py", line 28, in rouge_eval
rouge_results = r.convert_and_evaluate()
File "/usr/local/lib/python3.5/dist-packages/pyrouge-0.1.3-py3.5.egg/pyrouge/Rouge155.py", line 367, in convert_and_evaluate
rouge_output = self.evaluate(system_id, rouge_args)
File "/usr/local/lib/python3.5/dist-packages/pyrouge-0.1.3-py3.5.egg/pyrouge/Rouge155.py", line 342, in evaluate
rouge_output = check_output(command, env=env).decode("UTF-8")
File "/usr/lib/python3.5/subprocess.py", line 626, in check_output
**kwargs).stdout
File "/usr/lib/python3.5/subprocess.py", line 708, in run
output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['/usr/local/ROUGE-1.5.5/ROUGE-1.5.5.pl', '-e', '/usr/local/ROUGE-1.5.5/data', '-c', '95', '-2', '-1', '-U', '-r', '1000', '-n', '4', '-w', '1.2', '-a', '-m', '/tmp/tmpw5iw2_0n/rouge_conf.xml']' returned non-zero exit status 255