From 91fb2972b426f5d048d621ba473e30a82b2a8507 Mon Sep 17 00:00:00 2001
From: Alex Booker <alexbooker@fastmail.im>
Date: Fri, 14 Aug 2015 18:12:27 +0100
Subject: [PATCH] added guard clause

---
 js/passwordGenerator.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/js/passwordGenerator.js b/js/passwordGenerator.js
index 6615d06f..13e7d41b 100644
--- a/js/passwordGenerator.js
+++ b/js/passwordGenerator.js
@@ -1,5 +1,8 @@
 var passwordGenerator = (function() {
   var generateRandomNum = function (max) {
+    if (!window.crypto || !window.crypto.getRandomValues) {
+      throw new Error('Unsupported browser.');
+    }
     var array = new Uint8Array(1);
     window.crypto.getRandomValues(array);
     var range = max + 1;