From b2a589933639f94ae81ea8a746c622d32184f394 Mon Sep 17 00:00:00 2001
From: jos <wjosdejong@gmail.com>
Date: Tue, 9 Dec 2014 14:24:27 +0100
Subject: [PATCH] Fixed broken barCharts with handleOverlap=='stack'

---
 lib/timeline/component/LineGraph.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/timeline/component/LineGraph.js b/lib/timeline/component/LineGraph.js
index 892c8171..d10bb17d 100644
--- a/lib/timeline/component/LineGraph.js
+++ b/lib/timeline/component/LineGraph.js
@@ -820,7 +820,8 @@ LineGraph.prototype._updateYAxis = function (groupIds, groupRanges) {
   if (groupIds.length > 0) {
     // this is here to make sure that if there are no items in the axis but there are groups, that there is no infinite draw/redraw loop.
     for (var i = 0; i < groupIds.length; i++) {
-      if (this.groups[groupIds[i]].options.yAxisOrientation == 'left') {
+      var group = this.groups[groupIds[i]];
+      if (group && group.options.yAxisOrientation == 'left') {
         yAxisLeftUsed = true;
         minLeft = 0;
         maxLeft = 0;