From 7b80263718187dbd7400b21d637aaa32d5a8804c Mon Sep 17 00:00:00 2001
From: Ian Gilman <ian@iangilman.com>
Date: Thu, 21 Aug 2014 10:11:21 -0700
Subject: [PATCH] Reinstating a small check.

---
 src/viewer.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/viewer.js b/src/viewer.js
index 45714ac2..93c8394b 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -2810,7 +2810,9 @@ function lightUp() {
 
 
 function onHome() {
-    this.viewport.goHome();
+    if ( this.viewport ) {
+        this.viewport.goHome();
+    }
 }