Plugin bugged a site after removal

I decided to remove the stats counter because it was showing up some images on the bottom ruining the website layout.

After removing it though, the plugin left an unfixable bug where a text input

<\/body>

I think it was supposed to be doing a markup to cut the ‘</body>’ but failed

appeared at the bottom of the page. Now the site is even uglier with a grey text <\/body>

Any idea how to fix this?

https://www.ads-software.com/plugins/official-statcounter-plugin-for-wordpress/