From dbbb28213273a5146151eb5aeb2978fd62384bbd Mon Sep 17 00:00:00 2001
From: alb3ric <alb3ric@users.noreply.github.com>
Date: Thu, 10 Sep 2020 19:02:37 +0200
Subject: [PATCH] Fix exception when reading duplicate sftp extensions

#726
---
 src/Renci.SshNet/Common/SshData.cs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/Renci.SshNet/Common/SshData.cs b/src/Renci.SshNet/Common/SshData.cs
index 8e4eca406..fecfc5af3 100644
--- a/src/Renci.SshNet/Common/SshData.cs
+++ b/src/Renci.SshNet/Common/SshData.cs
@@ -251,7 +251,14 @@ protected IDictionary<string, string> ReadExtensionPair()
             {
                 var extensionName = ReadString(Ascii);
                 var extensionData = ReadString(Ascii);
-                result.Add(extensionName, extensionData);
+                if (result.ContainsKey(extensionName)) //if sftp extension is present multiple-times then keep the last one
+                {
+                    result[extensionName] = extensionData;
+                }
+                else
+                {
+                    result.Add(extensionName, extensionData);
+                }
             }
             return result;
         }