[Security] fixed cast

src/Symfony/Component/Security/Core/SecurityContext.php

@@ -63,7 +63,11 @@ class SecurityContext implements SecurityContextInterface
             $this->token = $this->authenticationManager->authenticate($this->token);
         }
 
-        return $this->accessDecisionManager->decide($this->token, (array) $attributes, $object);
+        if (!is_array($attributes)) {
+            $attributes = array($attributes);
+        }
+
+        return $this->accessDecisionManager->decide($this->token, $attributes, $object);
     }
 
     /**