Hi Chouby, I'm getting the same exact error:
Warning: Illegal string offset 'taxonomy' in /home/kaldimar/public_html/wp-content/plugins/polylang/frontend/frontend.php on line 88
In my case it only goes away by disabling the Cherry Plugin. Sadly, this is required for the theme to work, so disabling it is not an option and at the same time we're relying on Polylang for internationalization. Please advise, thanks.