From 74120e0df18669c0e00393ace867a6ef0c468d8f Mon Sep 17 00:00:00 2001
From: Scott González <scott.gonzalez@gmail.com>
Date: Thu, 18 Feb 2010 04:46:59 +0000
Subject: Draggable: Don't try to stack if there are no elements in the
 stacking group.

Fixes #5191 - Draggable: stack option can throw error.
---
 ui/jquery.ui.draggable.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ui/jquery.ui.draggable.js b/ui/jquery.ui.draggable.js
index f60c54c26..9496ce3f5 100644
--- a/ui/jquery.ui.draggable.js
+++ b/ui/jquery.ui.draggable.js
@@ -770,6 +770,7 @@ $.ui.plugin.add("draggable", "stack", {
 		var group = $.makeArray($(o.stack)).sort(function(a,b) {
 			return (parseInt($(a).css("zIndex"),10) || 0) - (parseInt($(b).css("zIndex"),10) || 0);
 		});
+		if (!group.length) { return; }
 		
 		var min = parseInt(group[0].style.zIndex) || 0;
 		$(group).each(function(i) {
-- 
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