From 0d8ea7407178fe85529ca5b56733635834e49f32 Mon Sep 17 00:00:00 2001
From: Federico Barresi <federico.barresi@evopro-ag.de>
Date: Thu, 7 May 2020 00:58:24 +0200
Subject: [PATCH] Check Connection on Socket close

---
 Sharp7/S7Client.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Sharp7/S7Client.cs b/Sharp7/S7Client.cs
index 06aea3a..be06749 100644
--- a/Sharp7/S7Client.cs
+++ b/Sharp7/S7Client.cs
@@ -723,7 +723,10 @@ namespace Sharp7
 
 		public int Disconnect()
 		{
-			Socket.Close();
+			if (Socket != null && Socket.Connected)
+			{
+				Socket.Close();
+			}
 			return 0;
 		}