From f947ed77914ad53624c4f63451c02c8e1e576501 Mon Sep 17 00:00:00 2001
From: Gary Katsevman <git@gkatsev.com>
Date: Fri, 5 Aug 2016 14:38:42 -0400
Subject: [PATCH] @gkatsev added null checks around navigator.userAgent. closes
 #3502

---
 CHANGELOG.md            | 1 +
 src/js/tech/html5.js    | 2 +-
 src/js/utils/browser.js | 3 ++-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 214540cb9..bec72786e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ CHANGELOG
 * @misteroneill added ghooks to run linter on git push ([view](https://github.com/videojs/video.js/pull/3459))
 * @BrandonOCasey removed unused base-styles.js file ([view](https://github.com/videojs/video.js/pull/3486))
 * @erikyuzwa, @gkatsev updated CSS build to inlcude the IE8-specific CSS from a separate file instead of it being inside of sass ([view](https://github.com/videojs/video.js/pull/3380)) ([view2](https://github.com/erikyuzwa/video.js/pull/1))
+* @gkatsev added null checks around navigator.userAgent ([view](https://github.com/videojs/video.js/pull/3502))
 
 --------------------
 
diff --git a/src/js/tech/html5.js b/src/js/tech/html5.js
index 2d64cb968..bc9ae8dfd 100644
--- a/src/js/tech/html5.js
+++ b/src/js/tech/html5.js
@@ -574,7 +574,7 @@ class Html5 extends Tech {
    */
   supportsFullScreen() {
     if (typeof this.el_.webkitEnterFullScreen === 'function') {
-      const userAgent = window.navigator.userAgent;
+      const userAgent = window.navigator && window.navigator.userAgent || "";
 
       // Seems to be broken in Chromium/Chrome && Safari in Leopard
       if ((/Android/).test(userAgent) || !(/Chrome|Mac OS X 10.5/).test(userAgent)) {
diff --git a/src/js/utils/browser.js b/src/js/utils/browser.js
index 72e52daff..d181aedc8 100644
--- a/src/js/utils/browser.js
+++ b/src/js/utils/browser.js
@@ -4,7 +4,7 @@
 import document from 'global/document';
 import window from 'global/window';
 
-const USER_AGENT = window.navigator.userAgent;
+const USER_AGENT = window.navigator && window.navigator.userAgent || "";
 const webkitVersionMap = (/AppleWebKit\/([\d.]+)/i).exec(USER_AGENT);
 const appleWebkitVersion = webkitVersionMap ? parseFloat(webkitVersionMap.pop()) : null;
 
@@ -30,6 +30,7 @@ export const IOS_VERSION = (function() {
   if (match && match[1]) {
     return match[1];
   }
+  return null;
 }());
 
 export const IS_ANDROID = (/Android/i).test(USER_AGENT);