From c1f236fce4e61e614862100ed7550796f86ce0bf Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@sugarlabs.org>
Date: Wed, 18 Dec 2013 03:14:58 +0000
Subject: check for keys for backward compatibility

---
(limited to 'elements')

diff --git a/elements/elements.py b/elements/elements.py
index 4d9a361..625844c 100644
--- a/elements/elements.py
+++ b/elements/elements.py
@@ -595,7 +595,7 @@ class Elements:
         for (k,v) in worldmodel['additional_vars'].items():
             addvars[k] = v
 
-        if serialized:
+        if serialized and 'trackinfo' in addvars:
             trackinfo = addvars['trackinfo']
             for key, info in trackinfo.iteritems():
                 if not info[3]:
--
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