From b1a0abd1041682a9d852c48139e63981f3da2aa5 Mon Sep 17 00:00:00 2001
From: Antoine Vandecreme <ant.vand@gmail.com>
Date: Tue, 19 Apr 2016 18:13:12 -0400
Subject: [PATCH] Add this.viewer test.

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

diff --git a/src/viewport.js b/src/viewport.js
index a2a9cc26..5095a9d5 100644
--- a/src/viewport.js
+++ b/src/viewport.js
@@ -341,7 +341,9 @@ $.Viewport.prototype = {
         }, margins);
 
         this._updateContainerInnerSize();
-        this.viewer.forceRedraw();
+        if (this.viewer) {
+            this.viewer.forceRedraw();
+        }
     },
 
     /**