diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 5646f945..8fd6826f 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -200,6 +200,10 @@ class ShopController extends BaseAuthedController
         }
 
         $goods = mt\ShopGoods::get($id);
+        if (!$goods) {
+            $this->_rspErr(1, 'id is invalid. {$id}');
+        }
+        
         if ($goods['shop_id'] == 9 && $goods_num > 1) {
             $this->_rspErr(1, 'goods_num is invalid');
         }