diff --git a/yohobuy/www.yohobuy.com/application/models/Shopping/Cart.php b/yohobuy/www.yohobuy.com/application/models/Shopping/Cart.php
index bb5fd4a..881e10e 100644
--- a/yohobuy/www.yohobuy.com/application/models/Shopping/Cart.php
+++ b/yohobuy/www.yohobuy.com/application/models/Shopping/Cart.php
@@ -1078,7 +1078,7 @@ class CartModel
                 }
                 /* 检查联盟参数是否有效 */
                 $unionInfo = empty($unionKey) ? array() : json_decode($unionKey, true);
-                if (empty($unionKey) && empty($_COOKIE['union_data'])){
+                if (empty($unionKey) && !empty($_COOKIE['union_data'])){
                     $unionKey = $_COOKIE['union_data'];
                 }
                 /* 模拟APP的User-Agent */