diff --git a/controllers/backend/DefaultController.php b/controllers/backend/DefaultController.php
index 7853afe..4227a00 100644
--- a/controllers/backend/DefaultController.php
+++ b/controllers/backend/DefaultController.php
@@ -310,7 +310,7 @@ public static function getMenuTree($language, $expandLevel, $hideMissingLanguage
 			DefaultController::populateChildrenRecursive ( $rootItem, $itemIndex, $expandLevel, 1 );
 			return $rootItem;
 		} else {
-			throw new Exception('Missing root hierarchy item (with id = '.DefaultController::$ROOT_HIERARCHY_ITEM_ID.'). Can not build page tree.');
+			throw new \Exception('Missing root hierarchy item (with id = '.DefaultController::$ROOT_HIERARCHY_ITEM_ID.'). Can not build page tree.');
 		}
 		return null;
 	}