diff --git a/src/Client/ZB.MOM.WW.OtOpcUa.Client.UI/ViewModels/HistoryViewModel.cs b/src/Client/ZB.MOM.WW.OtOpcUa.Client.UI/ViewModels/HistoryViewModel.cs
index 462ba9a..d828dfa 100644
--- a/src/Client/ZB.MOM.WW.OtOpcUa.Client.UI/ViewModels/HistoryViewModel.cs
+++ b/src/Client/ZB.MOM.WW.OtOpcUa.Client.UI/ViewModels/HistoryViewModel.cs
@@ -73,7 +73,7 @@ public partial class HistoryViewModel : ObservableObject
     {
         if (string.IsNullOrEmpty(SelectedNodeId)) return;
 
-        IsLoading = true;
+        _dispatcher.Post(() => IsLoading = true);
         _dispatcher.Post(() => Results.Clear());
 
         try