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);