diff --git a/upload/admin/controller/sale/order.php b/upload/admin/controller/sale/order.php
index <HASH>..<HASH> 100644
--- a/upload/admin/controller/sale/order.php
+++ b/upload/admin/controller/sale/order.php
@@ -1765,7 +1765,7 @@ class ControllerSaleOrder extends Controller {
 				$products = $this->model_sale_order->getOrderProducts($order_id);
 
 				foreach ($products as $product) {
-					$option_weight = '';
+					$option_weight = 0;
 
 					$product_info = $this->model_catalog_product->getProduct($product['product_id']);
Update order.php

it should be numberric