fix Undefined index2

app/Http/Controllers/Admin/GameDataController.php

@@ -530,7 +530,7 @@ class GameDataController extends Controller
             'recharge' => array_values($result['recharge'] ?? []),
             'withdraw' => array_values($result['withdraw'] ?? []),
             'profit' => array_values($result['profit'] ?? []),
-            'created_at' => array_values($result['created_at'] ?? null),
+            'created_at' => array_values($result['created_at'] ?? []),
             'yonline' => array_values($result['yonline'] ?? []),
             'yreg' => array_values($result['yreg'] ?? []),
             'yactive' => array_values($result['yactive'] ?? []),