Fix

database/seeders/EnvironmentSeeder.php

@@ -20,5 +20,10 @@ class EnvironmentSeeder extends Seeder
             'name' => 'production',
             'project_id' => $project_1->id,
         ]);
+        Environment::create([
+            'id' => 2,
+            'name' => 'staging',
+            'project_id' => $project_1->id,
+        ]);
     }
 }