From a385a74c4d2a81fa6264e81cfb27a468939bd3ee Mon Sep 17 00:00:00 2001
From: Michael Zillgith <michael.zillgith@mz-automation.de>
Date: Wed, 15 Feb 2023 14:14:16 +0100
Subject: [PATCH] - fixed - .NET: IedConenction.WriteDataSetValues throws a
 NullReferenceException (LIB61850-384)

---
 dotnet/IEC61850forCSharp/IEC61850ClientAPI.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dotnet/IEC61850forCSharp/IEC61850ClientAPI.cs b/dotnet/IEC61850forCSharp/IEC61850ClientAPI.cs
index 1403cbec..4b45fe54 100644
--- a/dotnet/IEC61850forCSharp/IEC61850ClientAPI.cs
+++ b/dotnet/IEC61850forCSharp/IEC61850ClientAPI.cs
@@ -1993,7 +1993,6 @@ namespace IEC61850
 
                 if (accessResults != IntPtr.Zero)
                 {
-
                     IntPtr element = LinkedList_getNext(accessResults);
 
                     while (element != IntPtr.Zero)
@@ -2004,6 +2003,9 @@ namespace IEC61850
 
                         MmsDataAccessError dataAccessError = accessResultValue.GetDataAccessError();
 
+                        if (accessResultList == null)
+                            accessResultList = new List<MmsDataAccessError>();
+
                         accessResultList.Add(dataAccessError);
 
                         element = LinkedList_getNext(element);