From 47d05fcac1626eae067ede078887dfbb55515c3c Mon Sep 17 00:00:00 2001
From: Jaifroid <egk10@cam.ac.uk>
Date: Sat, 15 Jun 2019 16:18:37 +0100
Subject: [PATCH] Prevent exception on resize

Former-commit-id: dc16e593b40cc01078616638d5c21b99894cd03e [formerly 05832a9874b0154183f7ac9919f3eb3ea23a6b43]
Former-commit-id: 561a3194705ff28afc571d8fdf7fed4e4310a0f5
---
 www/js/app.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/www/js/app.js b/www/js/app.js
index 448462d5..b7856979 100644
--- a/www/js/app.js
+++ b/www/js/app.js
@@ -100,7 +100,9 @@ define(['jquery', 'zimArchiveLoader', 'uiUtil', 'images', 'cookies', 'q', 'trans
         $(window).resize(function() {
             resizeIFrame;
             // We need to load any images exposed by the resize
-            document.getElementById('articleContent').contentWindow.onscroll();
+            var scrollFunc = document.getElementById('articleContent').contentWindow;
+            scrollFunc = scrollFunc ? scrollFunc.onscroll : null;
+            if (scrollFunc) scrollFunc();
         });
 
         ////Polyfill scrollStopped event