current_observation missing in json response

Since last thursday (2017-03-16 19:50:03 CET) current_observation is missing in my API response:

My request: 
<b>http://api.wunderground.com/api/wuAPIkey/conditions/lang:NL/q/pws:IGELDERL218/NL/Harderwijk.json</b>

My response:
{  
  "response": {
  "version":"0.1",
  "termsofService":"http://www.wunderground.com/weather/api/d/terms.html";,
  "features": {
  "conditions": 1
  }
, "results": [
{
"name": "Harderwijk",
"city": "Harderwijk",
"state": "GE",
"country": "NL",
"country_iso3166":"NL",
"country_name":"Nederland",
"zmw": "00000.6.06269",
"l": "/q/zmw:00000.6.06269"
}
,
{
"name": "Harderwijk",
"city": "Harderwijk",
"state": "NH",
"country": "NL",
"country_iso3166":"NL",
"country_name":"Nederland",
"zmw": "00000.8.06244",
"l": "/q/zmw:00000.8.06244"
}
]
}
}