Scroll Depth does'nt work with my website

Hi I installed scroll depth.
It’s in the Head section of my website after the google analytics plugin. When I try to go to events in google analytics nothing shows (even though i did some tests by scrolling away!) but when I go to the javascript console there’s an error message: “Uncaught TypeError: Array.prototype.push called on null or undefined”

thanks

https://www.ads-software.com/plugins/wp-scroll-depth/