From 731db6ab2d9d0bb1cf9d2d3b0bb54d3d09455666 Mon Sep 17 00:00:00 2001
From: Mark Collins <tera_1225@hotmail.com>
Date: Tue, 27 Feb 2018 14:05:47 +0100
Subject: [PATCH] Check that oldWindowLoad is a function in src/context.js
 Prevent warning in Firefox console:   "TypeError: oldWindowLoad is not a
 function"

---
 src/context.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/context.js b/src/context.js
index d6c52f70..58b9455c 100644
--- a/src/context.js
+++ b/src/context.js
@@ -291,7 +291,7 @@
   }
 
   window.onload = function() {
-    if (oldWindowLoad) {
+    if (typeof oldWindowLoad === 'function') {
       oldWindowLoad()
     }
     Context.refreshAll()