dictionary update sequence ValueError in appapi about appdaemon HOT 5 CLOSED

2017-02-04 11:15:05.752874 WARNING ------------------------------------------------------------
2017-02-04 11:15:05.753426 WARNING Unexpected error in worker for App presence_listener:
2017-02-04 11:15:05.754236 WARNING Worker Ags: {'type': 'event', 'kwargs': {}, 'event': 'internal_trigger_ishome', 'function': <bound method PresenceListener.person_is_home of <presence_listener.PresenceListener object at 0x708a9250>>, 'id': UUID('5feaadfb-ade3-4790-875c-8404c08d19ae'), 'data': {'mac': 'a1:11:1a:a1:11:1a', 'last_seen': '2017-02-04 11:15:05'}, 'name': 'presence_listener'}
2017-02-04 11:15:05.754639 WARNING ------------------------------------------------------------
2017-02-04 11:15:05.758652 WARNING Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/appdaemon/appdaemon.py", line 458, in worker
    function(args["event"], data, args["kwargs"])
  File "/home/homeassistant/.homeassistant/appdaemon/conf/apps/presence_listener.py", line 91, in person_is_home
    attributes=json.dumps(attributes))
  File "/usr/local/lib/python3.4/dist-packages/appdaemon/appapi.py", line 185, in set_state
    args["attributes"].update(kwargs["attributes"])
ValueError: dictionary update sequence element #0 has length 1; 2 is required

2017-02-04 11:15:05.759490 WARNING ------------------------------------------------------------

        # build the attributes for set_state()
        attributes = {
            "user_name": self.users[mac]['friendly_name'],
            "mac": mac,
            "last_seen": last_seen,
            "friendly_name": "Presence",
            "icon": "mdi:home"
        }

        # expose this information to the front end, including the full object
        self.set_state('binary_sensor.{}_presence'.format(self.users[mac]['friendly_name'].lower()),
                       state=self.users[mac]['location'],
                       attributes=json.dumps(attributes))