diff --git a/packageE/pages/cart/cart2_pt/cart2_pt.js b/packageE/pages/cart/cart2_pt/cart2_pt.js
index 35e3360..072bfe0 100644
--- a/packageE/pages/cart/cart2_pt/cart2_pt.js
+++ b/packageE/pages/cart/cart2_pt/cart2_pt.js
@@ -1851,7 +1851,7 @@ Page({
       return th.get_wuliu(th.calculatePrice2());
     }
     
-    if (ty !=0 && th.data.using_quan[th.data.bn_pick].isby==1) {
+    if (ty !=0 && th.data.using_quan[th.data.bn_pick] && th.data.using_quan[th.data.bn_pick].isby==1) {
       let using_quan={
         [th.data.bn_pick]:{
           is_nouse_red:1