diff --git a/app/Endpoint/Api/Http/Controllers/ShoppingCartItemController.php b/app/Endpoint/Api/Http/Controllers/ShoppingCartItemController.php
index e8382027..355c0e85 100644
--- a/app/Endpoint/Api/Http/Controllers/ShoppingCartItemController.php
+++ b/app/Endpoint/Api/Http/Controllers/ShoppingCartItemController.php
@@ -88,6 +88,8 @@ class ShoppingCartItemController extends Controller
             throw new ProductOfflineException();
         }
 
+        $sku->load('spu');
+
         if ($input['quantity'] > $sku->saleable_stock) {
             throw new ProductNotEnoughException();
         }