From f8f87a4fe67a1539b6fb85a54e4c178474792285 Mon Sep 17 00:00:00 2001
From: hxb <hxb@hdlchina.com.cn>
Date: 星期二, 20 九月 2022 13:22:22 +0800
Subject: [PATCH] 完善后退功能

---
 HDL_ON/DAL/DriverLayer/Control_TcpServer.cs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/HDL_ON/DAL/DriverLayer/Control_TcpServer.cs b/HDL_ON/DAL/DriverLayer/Control_TcpServer.cs
index 295098b..1c4daa9 100644
--- a/HDL_ON/DAL/DriverLayer/Control_TcpServer.cs
+++ b/HDL_ON/DAL/DriverLayer/Control_TcpServer.cs
@@ -183,7 +183,7 @@
         {
             MainPage.Log($"0001 tcpDataString:\r\n {tcpBodyDataString}");
             var tcpDataObj = Control.Ins.AnalysisReceiveData(tcpBodyDataString, null);
-            if (tcpDataObj.BodyDataString == null)
+            if (tcpDataObj==null || tcpDataObj.BodyDataString == null)
             {
                 return;
             }

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