Window.gtag is not a function

Explanation:

This error occurs when the window.gtag is not defined as a function.

The window.gtag function is typically used for sending event data to Google Analytics.

Example:

Let’s assume you have added the Google Analytics code snippet to your website:

<!-- Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=GA_TRACKING_ID"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}

  gtag('js', new Date());
  gtag('config', 'GA_TRACKING_ID');
</script>
<!-- End Google Analytics -->

In this code, the window.gtag function is defined as a function that pushes arguments to the dataLayer array.

If you encounter the “window.gtag is not a function” error, it means that the window.gtag function is not available.

Make sure that you have included the Google Analytics script correctly and that it is being loaded before any calls to gtag.

Also, ensure that the GA_TRACKING_ID is replaced with your actual Google Analytics tracking ID.

If the issue persists, check for any conflicts with other scripts on your page that may be overwriting or overriding the window.gtag function.