fix potential null errors in recordData/graphPeakData

lib/database.js

@@ -77,10 +77,12 @@ class Database {
 
       // Query recordData
       // When complete increment completeTasks to know when complete
-      this.getRecord(serverRegistration.data.ip, (playerCount, timestamp) => {
-        serverRegistration.recordData = {
-          playerCount,
-          timestamp: TimeTracker.toSeconds(timestamp)
+      this.getRecord(serverRegistration.data.ip, (hasRecord, playerCount, timestamp) => {
+        if (hasRecord) {
+          serverRegistration.recordData = {
+            playerCount,
+            timestamp: TimeTracker.toSeconds(timestamp)
+          }
         }
 
         // Check if completedTasks hit the finish value
@@ -102,7 +104,21 @@ class Database {
   getRecord (ip, callback) {
     this._sql.all('SELECT MAX(playerCount), timestamp FROM pings WHERE ip = ?', [
       ip
-    ], (_, data) => callback(data[0]['MAX(playerCount)'], data[0].timestamp))
+    ], (_, data) => {
+      // For empty results, data will be length 1 with [null, null]
+      const playerCount = data[0]['MAX(playerCount)']
+      const timestamp = data[0].timestamp
+
+      // Allow null timestamps, the frontend will safely handle them
+      // This allows insertion of free standing records without a known timestamp
+      if (playerCount !== null) {
+        // eslint-disable-next-line standard/no-callback-literal
+        callback(true, playerCount, timestamp)
+      } else {
+        // eslint-disable-next-line standard/no-callback-literal
+        callback(false)
+      }
+    })
   }
 
   insertPing (ip, timestamp, unsafePlayerCount) {