diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 76d4e184..206fe569 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -1374,10 +1374,11 @@ class ShopController extends BaseAuthedController
             }
         }
 
-        $goods['free_num'] = 0;
         if (!empty($goods['free_type'])) {
             $count = $this->countFreeBuyTimes($goods['free_type'], $goods['id'], $goods['goods_id']);
             $goods['free_num'] = $goods['free_num'] - $count;
+        } else {
+            $goods['free_num'] = 0;
         }
 
         $free_num = $goods['free_num'];