diff --git a/app/Http/Controllers/V1/Server/DeepbworkController.php b/app/Http/Controllers/V1/Server/DeepbworkController.php
index b0b92b9..f5f40cc 100644
--- a/app/Http/Controllers/V1/Server/DeepbworkController.php
+++ b/app/Http/Controllers/V1/Server/DeepbworkController.php
@@ -49,7 +49,7 @@ class DeepbworkController extends Controller
                 "alter_id" => 0,
                 "level" => 0,
             ];
-            unset($user['uuid']);
+            unset($user->uuid);
             array_push($result, $user);
         }
         $eTag = sha1(json_encode($result));
diff --git a/app/Http/Controllers/V1/Server/TrojanTidalabController.php b/app/Http/Controllers/V1/Server/TrojanTidalabController.php
index b5941ca..6092622 100644
--- a/app/Http/Controllers/V1/Server/TrojanTidalabController.php
+++ b/app/Http/Controllers/V1/Server/TrojanTidalabController.php
@@ -46,7 +46,7 @@ class TrojanTidalabController extends Controller
             $user->trojan_user = [
                 "password" => $user->uuid,
             ];
-            unset($user['uuid']);
+            unset($user->uuid);
             array_push($result, $user);
         }
         $eTag = sha1(json_encode($result));
diff --git a/app/Services/ServerService.php b/app/Services/ServerService.php
index 807ca38..5881b23 100644
--- a/app/Services/ServerService.php
+++ b/app/Services/ServerService.php
@@ -12,6 +12,7 @@ use App\Models\ServerVmess;
 use App\Models\ServerTrojan;
 use App\Utils\CacheKey;
 use App\Utils\Helper;
+use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\Cache;
 
 class ServerService
@@ -161,7 +162,7 @@ class ServerService
         }, $servers);
     }
 
-    public function getAvailableUsers($groupId)
+    public function getAvailableUsers($groupId): Collection
     {
         return \DB::table('v2_user')
             ->whereIn('group_id', $groupId)