多个引用导致json序列化错误

src/main/java/com/chaozhanggui/system/cashierservice/service/CartService.java

@@ -1,5 +1,6 @@
 package com.chaozhanggui.system.cashierservice.service;
 
+import cn.hutool.core.bean.BeanUtil;
 import cn.hutool.core.date.DateUtil;
 import cn.hutool.core.thread.ThreadUtil;
 import cn.hutool.core.util.StrUtil;
@@ -371,7 +372,7 @@ public class CartService {
             data.put("msg", "成功");
             data.put("type", "addcart");
             data.put("data", jsonArray);
-            data.put("seatFee", seatCost);
+            data.put("seatFee", BeanUtil.copyProperties(seatCost, TbCashierCart.class));
             data.put("amount", amount);
             data.put("reqData", jsonObject);
             PushToAppChannelHandlerAdapter.getInstance().AppSendInfo(JSONObject.toJSONString(data), tableCartKey, "", false);