homeserver - 2018-05-18 00:40:04,123 - synapse.federation.federation_server - 643 - ERROR - Failed to handle edu 'm.receipt'
Traceback (most recent call last):
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/synapse/federation/federation_server.py", line 639, in on_edu
    yield handler(origin, content)
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/python/failure.py", line 422, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/synapse/handlers/receipts.py", line 84, in _received_remote_receipt
    yield self._handle_new_receipts(receipts)
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/python/failure.py", line 422, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/synapse/handlers/receipts.py", line 101, in _handle_new_receipts
    room_id, receipt_type, user_id, event_ids, data
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/python/failure.py", line 422, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/synapse/storage/receipts.py", line 456, in insert_receipt
    stream_id=stream_id,
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1386, in _inlineCallbacks
    result = g.send(result)
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/synapse/storage/_base.py", line 323, in runInteraction
    after_callback(*after_args, **after_kwargs)
  File "/home/matrix/.synapse/local/lib/python2.7/site-packages/synapse/storage/receipts.py", line 308, in _invalidate_get_users_with_receipts_in_room
    if user_id in res:
TypeError: argument of type 'ObservableDeferred' is not iterable