diff -r 32af4954e46a Lib/idlelib/MultiCall.py
--- a/Lib/idlelib/MultiCall.py	Tue Feb 04 18:44:17 2014 -0800
+++ b/Lib/idlelib/MultiCall.py	Wed Feb 05 14:49:05 2014 +0200
@@ -227,7 +227,13 @@
 
     def __del__(self):
         for seq, id in self.handlerids:
-            self.widget.unbind(self.widgetinst, seq, id)
+            try:
+                self.widget.unbind(self.widgetinst, seq, id)
+            except tkinter.TclError:
+                # The underlying Tk widget has probably been destroyed.
+                # No need to try to unbind the rest of the handlers.
+                # see: http://bugs.python.org/issue20167
+                break
 
 # define the list of event types to be handled by MultiEvent. the order is
 # compatible with the definition of event type constants.