diff --git a/lib/plugins/gtag.js b/lib/plugins/gtag.js
index 9d62181f..e484e6dd 100644
--- a/lib/plugins/gtag.js
+++ b/lib/plugins/gtag.js
@@ -1,5 +1,6 @@
 // https://developers.google.com/analytics/devguides/collection/gtagjs/pages
 export const pageview = (url, ANALYTICS_GOOGLE_ID) => {
+  if (window.gtag === undefined) { return }
   window.gtag('config', ANALYTICS_GOOGLE_ID, {
     page_path: url
   })
@@ -7,6 +8,7 @@ export const pageview = (url, ANALYTICS_GOOGLE_ID) => {
 
 // https://developers.google.com/analytics/devguides/collection/gtagjs/events
 export const event = ({ action, category, label, value }) => {
+  if (window.gtag === undefined) { return }
   window.gtag('event', action, {
     event_category: category,
     event_label: label,