Sentry Issue: [ENGINE-TZJ](https://sentry.io/organizations/minds-inc/issues/2262580862/?referrer=gitlab_integration) ``` Exception: Referrer GUID is required in /var/www/Minds/engine/Core/Referrals/Repository.php:138 Stack trace: #0 /var/www/Minds/engine/Core/Referrals/Manager.php(65): Minds\Core\Referrals\Repository->add(Object(Minds\Core\Referrals\Referral)) #1 /var/www/Minds/engine/Core/Events/Hooks/Register.php(57): Minds\Core\Referrals\Manager->add(Object(Minds\Core\Referrals\Referral)) #2 [internal function]: Minds\Core\Events\Hooks\Register->Minds\Core\Events\Hooks\{closure}(Object(Minds\Core\Events\Event)) #3 /var/www/Minds/engine/Core/Events/Dispatcher.php(145): call_user_func_array(Object(Closure), Array) #4 /var/www/Minds/engine/Controllers/api/v1/register.php(127): Minds\Core\Events\Dispatcher::trigger('register', 'user', Array) #5 /var/www/Minds/engine/Api/Factory.php(87): Minds\Controllers\api\v1\register->post(Array) #6 /var/www/Minds/engine/Controllers/api/api.php(81): Minds\Api\Factory::build(Array, Object(Zend\Diactoros\ServerRequest), Object(Zend\Diactoros\Response\JsonResponse)) #7 /var/www/Minds/engine/Core ```