// Fix #PSCFV-4468

controllers/admin/AdminCartsController.php

@@ -295,7 +295,7 @@ class AdminCartsControllerCore extends AdminController
 			$this->initFooter();
 			$this->context->smarty->assign(array('customization_errors' => implode('<br />', $errors),
 															'css_files' => $this->css_files));
-			return $this->context->smarty->display('controllers/orders/form_customization_feedback.tpl');
+			return $this->smartyOutputContent('controllers/orders/form_customization_feedback.tpl');
 		}
 	}