From f44d5e1e815ce63b58264b2f9a764c0b03101cfc Mon Sep 17 00:00:00 2001
From: Rick Waldron <waldron.rick@gmail.com>
Date: Wed, 17 Aug 2011 17:49:09 -0400
Subject: [PATCH] Ensure cache[id] exists before attempting to delete it. Fixes
 #10080

---
 src/data.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/data.js b/src/data.js
index 4f87a3550..936cd76b8 100644
--- a/src/data.js
+++ b/src/data.js
@@ -191,7 +191,8 @@ jQuery.extend({
 		// Browsers that fail expando deletion also refuse to delete expandos on
 		// the window, but it will allow it on all other JS objects; other browsers
 		// don't care
-		if ( jQuery.support.deleteExpando || cache != window ) {
+		// Ensure that this id actually exists in `cache` #10080
+		if ( cache[ id ] && ( jQuery.support.deleteExpando || cache != window ) ) {
 			delete cache[ id ];
 		} else {
 			cache[ id ] = null;