diff --git a/WEB/Controller/UserController.php b/WEB/Controller/UserController.php
index 7f833980..52d38a3f 100644
--- a/WEB/Controller/UserController.php
+++ b/WEB/Controller/UserController.php
@@ -173,6 +173,7 @@ class UserController
             $model = new UserModel();
             // $model->addToQueue();
             // $client = Client::getInstance();
+            if (! function_exists('pcntl_fork')) die('PCNTL functions not available on this PHP installation');
             switch ($pid = pcntl_fork()) {
                 case -1:
                    // @fail