when I open christophs "re: accounts created" mail

wazokazi.log

2015-10-15 10:13:35 [twisted] CRITICAL Unhandled error in Deferred:


Traceback (most recent call last):
  File "/usr/share/python/pixelated-user-agent/lib/python2.7/site-packages/twisted/internet/defer.py", line 1274, in unwindGenerator
    return _inlineCallbacks(None, gen, Deferred())
  File "/usr/share/python/pixelated-user-agent/lib/python2.7/site-packages/twisted/internet/defer.py", line 1128, in _inlineCallbacks
    result = g.send(result)
  File "/usr/share/python/pixelated-user-agent/lib/python2.7/site-packages/pixelated_user_agent-0.1-py2.7.egg/pixelated/adapter/mailstore/leap_mailstore.py", line 348, in _leap_message_to_leap_mail
    body = yield self._raw_message_body(message)
  File "/usr/share/python/pixelated-user-agent/lib/python2.7/site-packages/twisted/internet/defer.py", line 1274, in unwindGenerator
    return _inlineCallbacks(None, gen, Deferred())
--- <exception caught here> ---
  File "/usr/share/python/pixelated-user-agent/lib/python2.7/site-packages/twisted/internet/defer.py", line 1128, in _inlineCallbacks
    result = g.send(result)
  File "/usr/share/python/pixelated-user-agent/lib/python2.7/site-packages/pixelated_user_agent-0.1-py2.7.egg/pixelated/adapter/mailstore/leap_mailstore.py", line 362, in _raw_message_body
    content_doc = (yield message.get_wrapper().get_body(self.soledad))
  File "/usr/share/python/pixelated-user-agent/src/leap.mail/src/leap/mail/adaptors/soledad.py", line 693, in get_body
    d = store.get_doc('C-' + body_phash)
exceptions.TypeError: cannot concatenate 'str' and 'NoneType' objects