diff --git a/OnTopReplica/MainForm.cs b/OnTopReplica/MainForm.cs
index 9be80f9..477cd49 100644
--- a/OnTopReplica/MainForm.cs
+++ b/OnTopReplica/MainForm.cs
@@ -89,6 +89,11 @@ namespace OnTopReplica {
                 Settings.Default.RestoreLastWindowHwnd = CurrentThumbnailWindowHandle.Handle.ToInt64();
                 Settings.Default.RestoreLastWindowClass = CurrentThumbnailWindowHandle.Class;
             }
+            else {
+                Settings.Default.RestoreLastWindowTitle = string.Empty;
+                Settings.Default.RestoreLastWindowHwnd = 0;
+                Settings.Default.RestoreLastWindowClass = string.Empty;
+            }
 
             _msgPumpManager.Dispose();
             Program.Platform.CloseForm(this);