TypeError: Cannot read property 'message' of null

For sure! Here is the kibana client side error from the ajax request followed by the json console output.

TypeError: Cannot read property 'message' of null
    at https://<hostname>/kibana/bundles/kibana.bundle.js?v=16070:231:27746
    at processQueue (https://<hostname>/kibana/bundles/commons.bundle.js?v=16070:39:9912)
    at https://<hostname>/kibana/bundles/commons.bundle.js?v=16070:39:10805
    at Scope.$digest (https://<hostname>/kibana/bundles/commons.bundle.js?v=16070:39:21741)
    at Scope.$apply (https://<hostname>/kibana/bundles/commons.bundle.js?v=16070:39:24520)
    at done (https://<hostname>/kibana/bundles/commons.bundle.js?v=16070:38:9495)
    at completeRequest (https://<hostname>/kibana/bundles/commons.bundle.js?v=16070:38:13952)
    at XMLHttpRequest.requestError (https://<hostname>/kibana/bundles/commons.bundle.js?v=16070:38:14800)
	
	
{  
   "type":"response",
   "@timestamp":"2017-12-04T14:17:55Z",
   "tags":[  

   ],
   "pid":1733,
   "method":"get",
   "statusCode":400,
   "req":{  
      "url":"/api/index_patterns/_fields_for_wildcard?pattern=logstash-*&meta_fields=%5B%22_source%22",
      "method":"get",
      "headers":{  
         "accept":"application/json, text/plain, */*",
         "accept-encoding":"gzip, deflate, br",
         "accept-language":"en-GB;q=1,en-US;q=0.9,en;q=0.8,fr;q=0.7",
         "host":"<hostname>",
         "kbn-version":"6.0.0",
         "referer":"https://<hostname>/kibana/app/kibana",
         ... stripped some custom headers from our proxy ...
         "connection":"Keep-Alive"
      },
      "remoteAddress":"10.3.0.67",
      "userAgent":"10.3.0.67",
      "referer":"https://<hostname>/kibana/app/kibana"
   },
   "res":{  
      "statusCode":400,
      "responseTime":30,
      "contentLength":9
   },
   "message":"GET /api/index_patterns/_fields_for_wildcard?pattern=logstash-*&meta_fields=%5B%22_source%22 400 30ms - 9.0B"
}