Ensure cache[id] exists before attempting to delete it. Fixes #10080

Author: rwaldron

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;