From 94ddcc461b3528fb3bf977c653f513205f5e18ef Mon Sep 17 00:00:00 2001
From: wxr <464027401@qq.com>
Date: 星期二, 11 四月 2023 14:51:15 +0800
Subject: [PATCH] Merge remote-tracking branch 'origin/dev-cqy(1.5.9)' into Dev-Wxr

---
 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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