diff --git a/src/ManagedShell.WindowsTasks/ApplicationWindow.cs b/src/ManagedShell.WindowsTasks/ApplicationWindow.cs
index 192f022b..1a75dffa 100644
--- a/src/ManagedShell.WindowsTasks/ApplicationWindow.cs
+++ b/src/ManagedShell.WindowsTasks/ApplicationWindow.cs
@@ -360,9 +360,10 @@ public bool CanAddToTaskbar
                 bool isToolWindow = (extendedWindowStyles & (int)NativeMethods.ExtendedWindowStyles.WS_EX_TOOLWINDOW) != 0;
                 bool isAppWindow = (extendedWindowStyles & (int)NativeMethods.ExtendedWindowStyles.WS_EX_APPWINDOW) != 0;
                 bool isNoActivate = (extendedWindowStyles & (int)NativeMethods.ExtendedWindowStyles.WS_EX_NOACTIVATE) != 0;
+                bool isDeleted = NativeMethods.GetProp(Handle, "ITaskList_Deleted") != IntPtr.Zero;
                 IntPtr ownerWin = NativeMethods.GetWindow(Handle, NativeMethods.GetWindow_Cmd.GW_OWNER);
 
-                return isWindow && isVisible && (ownerWin == IntPtr.Zero || isAppWindow) && (!isNoActivate || isAppWindow) && !isToolWindow;
+                return isWindow && isVisible && (ownerWin == IntPtr.Zero || isAppWindow) && (!isNoActivate || isAppWindow) && !isToolWindow && !isDeleted;
             }
         }