Attribute error while parsing pcap file

[S-MaN14th]

File can be found at https://goo.gl/AWATmN
$captcp statistic file.pcap
Traceback (most recent call last):
File "/usr/bin/captcp", line 5868, in
sys.exit(captcp.run())
File "/usr/bin/captcp", line 5854, in run
ret = classinstance.process_final()
File "/usr/bin/captcp", line 4807, in process_final
self.process_final_data()
File "/usr/bin/captcp", line 4801, in process_final_data
self.rexmt_final(connection.sc1)
File "/usr/bin/captcp", line 4485, in rexmt_final
sc.user_data["tl-ps-avg"] = "%.2f" % numpy.mean(sc.user_data["_tl_pkt_sizes"])
AttributeError: 'NoneType' object has no attribute 'mean'