ReverseGeocoding against Nominatim Endpoint does not work

[FxKu]

Got this error with latitude=52.5537197 and longitude=13.3595911:

{
  "timestamp": 1534353545546,
  "status": 500,
  "error": "Internal Server Error",
  "exception": "org.json.JSONException",
  "message": "JSONObject[\"city\"] not found.",
  "path": "//v1/nominatim/reversegeocoding"
}