[HttpKernel] fixed error message

src/Symfony/Components/HttpKernel/HttpKernel.php

@@ -145,7 +145,7 @@ class HttpKernel implements HttpKernelInterface
         // view
         $event = $this->dispatcher->filter(new Event($this, 'core.view', array('request_type' => $type, 'request' => $request)), $retval);
 
-        return $this->filterResponse($event->getReturnValue(), $request, sprintf('The controller must return a response (instead of %s).', is_object($event->getReturnValue()) ? 'an object of class '.get_class($event->getReturnValue()) : str_replace("\n", '', var_export($event->getReturnValue(), true))), $type);
+        return $this->filterResponse($event->getReturnValue(), $request, sprintf('The controller must return a response (instead of %s).', is_object($event->getReturnValue()) ? 'an object of class '.get_class($event->getReturnValue()) : is_array($event->getReturnValue()) ? 'an array' : str_replace("\n", '', var_export($event->getReturnValue(), true))), $type);
     }
 
     /**