From 8d53cfdb177b773bf36e09d089093f9e0dcd7944 Mon Sep 17 00:00:00 2001
From: Cenatiempo Yannick <ycenatiempo@gmail.com>
Date: Thu, 28 Feb 2019 18:28:48 +0100
Subject: [PATCH] Prevent error for navigator without language

---
 tarteaucitron.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tarteaucitron.js b/tarteaucitron.js
index fc0f349..d5438a3 100644
--- a/tarteaucitron.js
+++ b/tarteaucitron.js
@@ -1242,7 +1242,7 @@ var tarteaucitron = {
             defaultLanguage = 'en',
             lang = navigator.language || navigator.browserLanguage ||
                 navigator.systemLanguage || navigator.userLang || null,
-            userLanguage = lang.substr(0, 2);
+            userLanguage = lang ? lang.substr(0, 2) : null;
 
         if (tarteaucitronForceLanguage !== '') {
             if (availableLanguages.indexOf(tarteaucitronForceLanguage) !== -1) {
@@ -1261,7 +1261,7 @@ var tarteaucitron = {
 
         var lang = navigator.language || navigator.browserLanguage ||
                 navigator.systemLanguage || navigator.userLang || null,
-            userLanguage = lang.substr(0, 2);
+            userLanguage = lang ? lang.substr(0, 2) : null;
 
         if (userLanguage === 'fr') {
             return 'fr_FR';