diff --git a/app/Classes/Modules/Affiliate/Services/TracksAffiliateRegistration.php b/app/Classes/Modules/Affiliate/Services/TracksAffiliateRegistration.php
index 7768f575..c0358ce0 100644
--- a/app/Classes/Modules/Affiliate/Services/TracksAffiliateRegistration.php
+++ b/app/Classes/Modules/Affiliate/Services/TracksAffiliateRegistration.php
@@ -17,7 +17,7 @@ class TracksAffiliateRegistration
      * @param User $user
      * @return Affiliate|null
      */
-    public function execute(User $user, string $code): ?Affiliate
+    public function execute(User $user, ?string $code = null): ?Affiliate
     {
         if (!$code || !$this->isValidCode($code)) {
             Log::info('Code is not valid', ['code' => $code]);