I am using a SERVER-SIDE TRACKING for my woocommerce site. In there I added a JS Tracking code snippet provided by company to the wp_head using , and for all other events. All other events are working fine, but when I tried to fire the add to cart, it show the error : Uncaught ReferenceError: _jts is not defined at

Uncaught ReferenceError: _xxx is not defined – WooCommerce add_to_cart hook

I am using a SERVER-SIDE TRACKING for my woocommerce site.

In there I added a JS Tracking code snippet provided by company to the wp_head using

<script>
   add_action('wp_head', array(
            $this,
            'tracking_code'
        ));
</script>

JavaScript
​x
 
<script>   add_action('wp_head', array(            $this,            'tracking_code'        ));</script>​

, and

<script>
    _xxx.push({
       "track"     : "pageview",
    });
</script>

JavaScript
 
<script>    _xxx.push({       "track"     : "pageview",    });</script>​

for all other events. All other events are working fine, but when I tried to fire the add to cart, it show the error :

Uncaught ReferenceError: _jts is not defined at ?add-to-cart=12:3:13

What can be the solution for this? Thanks for your time

The issue was the _xxx.push was loaded before the library loaded, fixed after added to footer.