Decryption Error

I also get the following frequently:

2017-05-02T09:03:17+0200 [leap.bitmask.mail.incoming.service.IncomingMail#info] Processing incoming mail 2017-05-02T09:03:17+0200 [leap.bitmask.mail.incoming.service.IncomingMail#info] decrypting msg: f7428731-c173-491c-bd16-0f10369dc4f0 2017-05-02T09:03:17+0200 [leap.bitmask.mail.incoming.service.IncomingMail#error] _decrypt_doc: Error decrypting document with ID f7428731-c173-491c-bd16-0f10369dc4f0 2017-05-02T09:03:17+0200 [leap.bitmask.mail.incoming.service.IncomingMail#info] Processing decrypted doc 2017-05-02T09:03:17+0200 [leap.bitmask.mail.incoming.service.IncomingMail#error] Error while decrypting f7428731-c173-491c-bd16-0f10369dc4f0 2017-05-02T09:03:17+0200 [leap.bitmask.mail.incoming.service.IncomingMail#error] No JSON object could be decoded 2017-05-02T09:03:17+0200 [leap.bitmask.mail.incoming.service.IncomingMail#info] Adding message f7428731-c173-491c-bd16-0f10369dc4f0 to local db 2017-05-02T09:03:17+0200 [leap.bitmask.mail.incoming.service.IncomingMail#error] Error while fetching incoming mail <twisted.python.failure.Failure twisted.internet.defer.FirstError: FirstError[#0, [Failure instance: Traceback: <type 'exceptions.TypeError'>: StringIO() argument 1 must be string or buffer, not list /home/sune/src/pixelated/bitmask-dev/venv/local/lib/python2.7/site-packages/twisted/internet/defer.py:653:_runCallbacks /home/sune/src/pixelated/bitmask-dev/venv/local/lib/python2.7/site-packages/twisted/internet/defer.py:1032:_cbDeferred /home/sune/src/pixelated/bitmask-dev/venv/local/lib/python2.7/site-packages/twisted/internet/defer.py:459:callback /home/sune/src/pixelated/bitmask-dev/venv/local/lib/python2.7/site-packages/twisted/internet/defer.py:567:_startRunCallbacks --- <exception caught here> --- /home/sune/src/pixelated/bitmask-dev/venv/local/lib/python2.7/site-packages/twisted/internet/defer.py:653:_runCallbacks /home/sune/src/pixelated/bitmask-dev/src/leap/bitmask/mail/incoming/service.py:864:_add_message_locally /home/sune/src/pixelated/bitmask-dev/src/leap/bitmask/mail/mail.py:616:add_msg /home/sune/src/pixelated/bitmask-dev/src/leap/bitmask/mail/adaptors/soledad.py:876:get_msg_from_string /home/sune/src/pixelated/bitmask-dev/src/leap/bitmask/mail/adaptors/soledad.py:1191:_split_into_parts /home/sune/src/pixelated/bitmask-dev/src/leap/bitmask/mail/adaptors/soledad.py:1210:_parse_msg /usr/lib/python2.7/email/__init__.py:57:message_from_string /usr/lib/python2.7/email/parser.py:82:parsestr ]]> 2017-05-02T09:03:17+0200 [leap.bitmask.mail.incoming.service.IncomingMail#info] Updating Incoming MSG: SoledadDoc f7428731-c173-491c-bd16-0f10369dc4f0