diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index 43f12d1..d3ab7df 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -2,6 +2,8 @@
 
 namespace App\Providers;
 
+use App\Models\User;
+use Illuminate\Support\Facades\Gate;
 use Illuminate\Support\ServiceProvider;
 
 class AppServiceProvider extends ServiceProvider
diff --git a/app/Providers/HorizonServiceProvider.php b/app/Providers/HorizonServiceProvider.php
index 3962d6f..70754f5 100644
--- a/app/Providers/HorizonServiceProvider.php
+++ b/app/Providers/HorizonServiceProvider.php
@@ -28,7 +28,7 @@ class HorizonServiceProvider extends HorizonApplicationServiceProvider
     protected function gate(): void
     {
         Gate::define('viewHorizon', function ($user = null) {
-            return $user->isAdmin();
+            return $user && $user->isAdmin();
         });
     }
 }