From e82a95fd142ac7a67abfe629934446f063eff22a Mon Sep 17 00:00:00 2001
From: jos <wjosdejong@gmail.com>
Date: Wed, 13 Aug 2014 10:17:51 +0200
Subject: [PATCH] Fixed a group "null" being displayed in IE when not using
 groups (see also #238)

---
 HISTORY.md                      | 1 +
 lib/timeline/component/Group.js | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/HISTORY.md b/HISTORY.md
index ea5f2066..c38167f0 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -18,6 +18,7 @@ http://visjs.org
 ### Timeline
 
 - Fixed items in groups sometimes being displayed but not positioned correctly.
+- Fixed a group "null" being displayed in IE when not using groups.
 
 ### Network
 
diff --git a/lib/timeline/component/Group.js b/lib/timeline/component/Group.js
index 3ca823e3..c4ebc69b 100644
--- a/lib/timeline/component/Group.js
+++ b/lib/timeline/component/Group.js
@@ -78,11 +78,11 @@ Group.prototype.setData = function(data) {
   if (content instanceof Element) {
     this.dom.inner.appendChild(content);
   }
-  else if (content != undefined) {
+  else if (content !== undefined && content !== null) {
     this.dom.inner.innerHTML = content;
   }
   else {
-    this.dom.inner.innerHTML = this.groupId;
+    this.dom.inner.innerHTML = this.groupId || ''; // groupId can be null
   }
 
   // update title