diff --git a/Tools/idle/WindowList.py b/Tools/idle/WindowList.py
index 537b31c12e3..3a85c1939e3 100644
--- a/Tools/idle/WindowList.py
+++ b/Tools/idle/WindowList.py
@@ -19,7 +19,10 @@ def add_windows_to_menu(self,  menu):
         list = []
         for key in self.dict.keys():
             window = self.dict[key]
-            title = window.get_title()
+            try:
+                title = window.get_title()
+            except TclError:
+                continue
             list.append((title, window))
         list.sort()
         for title, window in list: