Xenial: Internal Server Error when requesting Nagios Services

Internal Server Error: {u'kwargs': {}, u'args': (), u'request': <rest_framework.request.Request object at 0x7f24137d2450>, u'view': <nagios.restapi.ServiceProxyViewSet object at 0x7f24137d2150>}
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/rest_framework/views.py", line 463, in dispatch
    response = handler(request, *args, **kwargs)
  File "/usr/share/openattic/rest/multinode/handlers.py", line 64, in list
    results.append(serializer.data)
  File "/usr/lib/python2.7/dist-packages/rest_framework/serializers.py", line 503, in data
    ret = super(Serializer, self).data
  File "/usr/lib/python2.7/dist-packages/rest_framework/serializers.py", line 239, in data
    self._data = self.to_representation(self.instance)
  File "/usr/lib/python2.7/dist-packages/rest_framework/serializers.py", line 472, in to_representation
    ret[field.field_name] = field.to_representation(attribute)
  File "/usr/lib/python2.7/dist-packages/rest_framework/fields.py", line 1645, in to_representation
    return method(value)
  File "/usr/share/openattic/nagios/restapi.py", line 67, in get_performance_data
    return obj.perfdata
  File "/usr/share/openattic/nagios/models.py", line 89, in perfdata
    perfdata = self.state.get("performance_data", "").strip()
  File "/usr/share/openattic/nagios/models.py", line 84, in state
    raise KeyError("The status for this service could not be found in Nagios's status cache.")
KeyError: "The status for this service could not be found in Nagios's status cache."

GET /openattic/api/services
HTTP 500 Internal Server Error
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "detail": "\"The status for this service could not be found in Nagios's status cache.\""
}