diff --git a/PySimpleGUIQt/PySimpleGUIQt.py b/PySimpleGUIQt/PySimpleGUIQt.py
index 9504ebbc..b52ea73c 100644
--- a/PySimpleGUIQt/PySimpleGUIQt.py
+++ b/PySimpleGUIQt/PySimpleGUIQt.py
@@ -3213,6 +3213,8 @@ class Window:
         self.BackgroundImage = background_image
         self.XFound = False
         self.DisableMinimize = disable_minimize
+        self.UniqueKeyCounter = 0
+
         if layout is not None:
             self.Layout(layout)