Console output from safari (running on jherskowitz page)

[Log] successfully reported page (x34)
[Error] Failed to load resource: the server responded with a status of 500 (Internal Server Error) (submit-listens, line 0)
[Log] received http error 500 req'ing
[Error] TypeError: undefined is not an object (evaluating 'struct.payload.length')
enqueueReport (undefined, line 149)
onload
[Error] Failed to load resource: the server responded with a status of 500 (Internal Server Error) (submit-listens, line 0)
[Error] Failed to load resource: the server responded with a status of 500 (Internal Server Error) (submit-listens, line 0)
[Log] received http error 500 req'ing
[Error] TypeError: undefined is not an object (evaluating 'struct.payload.length')
enqueueReport (undefined, line 149)
onload
[Log] received http error 500 req'ing
[Error] TypeError: undefined is not an object (evaluating 'struct.payload.length')
enqueueReport (undefined, line 149)
onload
[Error] Failed to load resource: the server responded with a status of 500 (Internal Server Error) (submit-listens, line 0)
[Log] received http error 500 req'ing
[Error] TypeError: undefined is not an object (evaluating 'struct.payload.length')
enqueueReport (undefined, line 149)
onload
[Log] successfully reported page (x3)
[Error] TypeError: undefined is not a function (evaluating 'toReport.push(struct)')
enqueueReport (undefined, line 150)
reportPage
reportPageAndGetNext
onload

Associated server error:
Exception on /1/submit-listens [POST]
Traceback (most recent call last):
File "/home/listenbrainz/ve/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
response = self.full_dispatch_request()
File "/home/listenbrainz/ve/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/listenbrainz/ve/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/listenbrainz/ve/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
rv = self.dispatch_request()
File "/home/listenbrainz/ve/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "./webserver/decorators.py", line 32, in wrapped_function
resp = make_response(f(*args, **kwargs))
File "./webserver/views/api.py", line 40, in submit_listen
payload = data['payload']
TypeError: string indices must be integers