diff --git a/src/Symfony/Bridge/Twig/Extension/SecurityExtension.php b/src/Symfony/Bridge/Twig/Extension/SecurityExtension.php
index b13d7c0f85..fa5fae2e77 100644
--- a/src/Symfony/Bridge/Twig/Extension/SecurityExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/SecurityExtension.php
@@ -13,6 +13,7 @@ namespace Symfony\Bridge\Twig\Extension;
 
 use Symfony\Component\Security\Acl\Voter\FieldVote;
 use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
+use Symfony\Component\Security\Core\Exception\AuthenticationCredentialsNotFoundException;
 
 /**
  * SecurityExtension exposes security context features.
@@ -38,7 +39,11 @@ class SecurityExtension extends \Twig_Extension
             $object = new FieldVote($object, $field);
         }
 
-        return $this->securityChecker->isGranted($role, $object);
+        try {
+            return $this->securityChecker->isGranted($role, $object);
+        } catch (AuthenticationCredentialsNotFoundException $e) {
+            return false;
+        }
     }
 
     /**