From 52f2328ab1b45734c342e9021fe693795a03972d Mon Sep 17 00:00:00 2001
From: Aline Morelli <aline.morelliw@gmail.com>
Date: Thu, 29 Aug 2019 18:56:25 -0300
Subject: [PATCH] Fix: avoid push when datalayer doesnt exist (#37)

---
 dist/TagManager.js | 1 +
 package-lock.json  | 2 +-
 package.json       | 2 +-
 src/TagManager.js  | 5 ++++-
 4 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/dist/TagManager.js b/dist/TagManager.js
index 7f0bc7cd..115c753c 100644
--- a/dist/TagManager.js
+++ b/dist/TagManager.js
@@ -64,6 +64,7 @@ var TagManager = {
         _ref2$dataLayerName = _ref2.dataLayerName,
         dataLayerName = _ref2$dataLayerName === undefined ? 'dataLayer' : _ref2$dataLayerName;
 
+    if (window[dataLayerName]) return window[dataLayerName].push(_dataLayer);
     var snippets = _Snippets2.default.dataLayer(_dataLayer, dataLayerName);
     var dataScript = this.dataScript(snippets);
     document.head.appendChild(dataScript);
diff --git a/package-lock.json b/package-lock.json
index 2db8a948..e93f6a4f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "react-gtm-module",
-  "version": "2.0.5",
+  "version": "2.0.7",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 99664058..5f141e40 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-gtm-module",
-  "version": "2.0.7",
+  "version": "2.0.8",
   "description": "React Google Tag Manager Module",
   "main": "dist/index.js",
   "scripts": {
diff --git a/src/TagManager.js b/src/TagManager.js
index 902cf03b..f2abf1a1 100644
--- a/src/TagManager.js
+++ b/src/TagManager.js
@@ -43,7 +43,10 @@ const TagManager = {
     document.body.insertBefore(gtm.noScript(), document.body.childNodes[0])
   },
   dataLayer: function ({dataLayer, dataLayerName = 'dataLayer'}) {
-    window[dataLayerName].push(dataLayer)
+    if (window[dataLayerName]) return window[dataLayerName].push(dataLayer)
+    const snippets = Snippets.dataLayer(dataLayer, dataLayerName)
+    const dataScript = this.dataScript(snippets)
+    document.head.appendChild(dataScript)
   }
 }