Thread error - speedtest-cli

Hi.

if i try to run speedtest-cli on my ac68U with 378.55 i have this error:

Testing upload speed.......Exception in thread Thread-43:
Traceback (most recent call last):
File "/opt/lib/python2.7/threading.py", line 810, in __bootstrap_inner
self.run()
File "/opt/lib/python2.7/threading.py", line 763, in run
self.__target(*self.__args, **self.__kwargs)
File "/jffs/scripts/LaMetric/speedtest-cli", line 333, in producer
thread.start()
File...

Thread error - speedtest-cli