Crash while riding

[kbeckmann]

{"event_type": "power", "value": "143.256625004"}
{"event_type": "cad", "value": "76"}
Exception in thread ant.base:
Traceback (most recent call last):
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py", line 808, in __bootstrap_inner
self.run()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py", line 761, in run
self.__target(_self.__args, *_self.__kwargs)
File "/Library/Python/2.7/site-packages/ant/base/ant.py", line 116, in _worker
message = self.read_message()
File "/Library/Python/2.7/site-packages/ant/base/ant.py", line 221, in read_message
return Message.parse(packet)
File "/Library/Python/2.7/site-packages/ant/base/message.py", line 176, in parse
assert checksum == reduce(lambda x, y: x ^ y, buf[:-1])
AssertionError

See logs/20150503_1106.txt