diff --git a/Sinvo.EplanHpD.Plugin.WPFUI/View/LectotypeWindow.xaml.cs b/Sinvo.EplanHpD.Plugin.WPFUI/View/LectotypeWindow.xaml.cs
index bcf326b..b8699c6 100644
--- a/Sinvo.EplanHpD.Plugin.WPFUI/View/LectotypeWindow.xaml.cs
+++ b/Sinvo.EplanHpD.Plugin.WPFUI/View/LectotypeWindow.xaml.cs
@@ -181,7 +181,7 @@ namespace Sinvo.EplanHpD.Plugin.WPFUI
         {
             //DrawPDFHelper.ClearCache();
             WeakReferenceMessenger.Default.Unregister<CommonMessage>("RowDetailsVisibility");
-            WeakReferenceMessenger.Default.Unregister<CommonMessage>("OpenDraw");
+            WeakReferenceMessenger.Default.Unregister<OpenDrawMessage>("OpenDraw");
             MotorExcelHelper.Instance.CloseStream();
         }