From bc1cb122db30be034b3da84ee2546c86e2a5268f Mon Sep 17 00:00:00 2001
From: Dave Methvin <dave.methvin@gmail.com>
Date: Sun, 7 Dec 2014 20:51:04 -0500
Subject: Callbacks: Disabling a callback should prevent firing

Thanks to @TheDistantSea for the report!

Fixes gh-1790
Closes gh-1643
---
 src/callbacks.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'src/callbacks.js')

diff --git a/src/callbacks.js b/src/callbacks.js
index 30fa1a30f..55a9d719d 100644
--- a/src/callbacks.js
+++ b/src/callbacks.js
@@ -151,8 +151,10 @@ jQuery.Callbacks = function( options ) {
 			},
 			// Remove all callbacks from the list
 			empty: function() {
-				list = [];
-				firingLength = 0;
+				if ( list ) {
+					list = [];
+					firingLength = 0;
+				}
 				return this;
 			},
 			// Have the list do nothing anymore
-- 
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