From 758f5141e2bf536c04b7b4c1e2327a87d3b9d419 Mon Sep 17 00:00:00 2001
From: wjc <1243177876@qq.com>
Date: 星期三, 12 四月 2023 09:50:53 +0800
Subject: [PATCH] 2023年04月11日17:30:59

---
 HDL_ON/DAL/DriverLayer/Control_TcpClient.cs |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/HDL_ON/DAL/DriverLayer/Control_TcpClient.cs b/HDL_ON/DAL/DriverLayer/Control_TcpClient.cs
index c90eac3..251f039 100644
--- a/HDL_ON/DAL/DriverLayer/Control_TcpClient.cs
+++ b/HDL_ON/DAL/DriverLayer/Control_TcpClient.cs
@@ -295,7 +295,10 @@
                     }
                     finally
                     {
-                        heartBeatThread = null;
+                        if (heartBeatThread != null)
+                        {
+                            heartBeatThread = null;
+                        }
                         HeartBeat();
                     }
                 }

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