diff --git a/app/Http/Controllers/Auth/RegisterController.php b/app/Http/Controllers/Auth/RegisterController.php
index 15db3b7c9..05c2a9ac9 100644
--- a/app/Http/Controllers/Auth/RegisterController.php
+++ b/app/Http/Controllers/Auth/RegisterController.php
@@ -47,7 +47,7 @@ class RegisterController extends Controller
     /**
      * @var string
      */
-    private string $inviteCodeQuery;
+    private string $inviteCodeQuery = '';
 
     /**
      * Create a new controller instance.