Lighthouse reporting unload listener error

I was working on the performance of my page, using Lighthouse in the developer tool, through the Google Chrome browser, and I saw that there is a problem with "unload listener".

But the real problem is that I don't know if I can fix this, because apparently this is coming from the Google Analytics code or from Google Adsense. How can I solve a problem that Google reports, but which is also their problem?

Google Tag Services is the website from which the script with an error was downloaded

Error

Source

I really don't know if you can fix this, does anyone know if it's possible, otherwise, should I leave it as it is? This is the only problem in the Best Practices section, I would like to resolve

EDIT

Code:

<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-XDF203H0BD"> 
</script>
<script>
    window.dataLayer = window.dataLayer || [];

    function gtag() {
        dataLayer.push(arguments);
    }
    gtag('js', new Date());

    gtag('config', 'G-XDF203H0BD');
</script>