Arbiter fails when receiving an isMaster command with a $clusterTime

{ 

   "operationTime" : { "$timestamp" : { "t" : 1516663477, "i" : 1 } }, 

   "ok" : 0.0, 

   "errmsg" : "Cache Reader No keys found for HMAC that is valid for time: { ts: Timestamp(1516663477, 1) } with id: 0", 

   "code" : 211, 

   "codeName" : "KeyNotFound", 

   "$clusterTime" : { 

       "clusterTime" : { "$timestamp" : { "t" : 1516663477, "i" : 1 } }, 

       "signature" : { "hash" : { "$binary" : "AAAAAAAAAAAAAAAAAAAAAAAAAAA=", "$type" : "00" }, 

                              "keyId" : { "$numberLong" : "0" } } }

}