diff --git a/Models/NullDepartment.php b/Models/NullDepartment.php
index d1f6907..b20ae8a 100644
--- a/Models/NullDepartment.php
+++ b/Models/NullDepartment.php
@@ -34,5 +34,6 @@ final class NullDepartment extends Department
     public function __construct(int $id = 0)
     {
         $this->id = $id;
+        parent::__construct();
     }
 }