weekId error

ShopBundle/Repository/OrderShopRepository.php

@@ -255,7 +255,7 @@ class OrderShopRepository extends BaseRepository implements DefaultRepositoryInt
                 $query = $this->findByMerchantQuery();
                 $query = $this->filterOrderValid($query);
                 $query->andWhere('e.mainOrderShop = false OR  e.mainOrderShop IS NULL');
-                $query->orderBy('e.validationDate', 'DESC');
+                $query->orderBy('e.weekId', 'DESC');
                 $query->setMaxResults(1);
 
                 return $query->getQuery()->getOneOrNullResult();