diff --git a/ComIOP/Common/Client/Da/ComDaGroup.cs b/ComIOP/Common/Client/Da/ComDaGroup.cs
index 30f44717bb..000a083901 100644
--- a/ComIOP/Common/Client/Da/ComDaGroup.cs
+++ b/ComIOP/Common/Client/Da/ComDaGroup.cs
@@ -220,7 +220,8 @@ namespace Opc.Ua.Com.Client
                     for (int jj = 0; jj < monitoredItems.Length; jj++)
                     {
 
-                        if (info.LastValue.Value.GetType().IsArray
+                        if (info.LastValue.Value != null
+                            && info.LastValue.Value.GetType().IsArray
                             && monitoredItems[jj].IndexRange.Count != info.LastValue.Value.GetType().GetArrayRank()
                             && StatusCode.IsBad(info.LastValue.StatusCode))
                         {