Fixed crash when CSRF is disabled

Author: XWB

Controller/SecurityController.php

@@ -40,7 +40,7 @@ public function loginAction()
         // last username entered by the user
         $lastUsername = (null === $session) ? '' : $session->get(SecurityContext::LAST_USERNAME);
 
-        $csrfToken = $this->container->get('form.csrf_provider')->generateCsrfToken('authenticate');
+        $csrfToken = $this->container->has('form.csrf_provider') ? $this->container->get('form.csrf_provider')->generateCsrfToken('authenticate') : null;
 
         return $this->renderLogin(array(
             'last_username' => $lastUsername,