From 9265d3048785a8228d057cf2b7833bae02240d51 Mon Sep 17 00:00:00 2001
From: Cyrille Giquello <Cyrille37@users.noreply.github.com>
Date: Mon, 14 Dec 2020 17:51:01 +0100
Subject: [PATCH] TypeError: tarteaucitron.user.multiplegtagUa

A simple patch to avoid "Uncaught TypeError: tarteaucitron.user.multiplegtagUa" like reported in #474
https://github.com/AmauriC/tarteaucitron.js/issues/474
---
 tarteaucitron.services.js | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/tarteaucitron.services.js b/tarteaucitron.services.js
index 37950bf..40ba463 100644
--- a/tarteaucitron.services.js
+++ b/tarteaucitron.services.js
@@ -2816,14 +2816,15 @@ tarteaucitron.services.multiplegtag = {
         "use strict";
         window.dataLayer = window.dataLayer || [];
 
-        tarteaucitron.user.multiplegtagUa.forEach(function(ua) {
-
-            tarteaucitron.addScript('https://www.googletagmanager.com/gtag/js?id=' + ua, '', function () {
-                window.gtag = function gtag(){dataLayer.push(arguments);}
-                gtag('js', new Date());
-                gtag('config', ua);
+	if (tarteaucitron.user.multiplegtagUa !== undefined) {
+            tarteaucitron.user.multiplegtagUa.forEach(function(ua) {
+                tarteaucitron.addScript('https://www.googletagmanager.com/gtag/js?id=' + ua, '', function () {
+                    window.gtag = function gtag(){dataLayer.push(arguments);}
+                    gtag('js', new Date());
+                    gtag('config', ua);
+                });
             });
-        });
+	}
     }
 };