Help with fatal error on WP with plugin Woocomerce

I was working on my wordpress page (www.polvolula.com) when suddenly I found that I couldn’t access the page anymore. On the screen it appears:

“Fatal error: Cannot unset string offsets in /home/polvolul/public_html/wp-content/plugins/woocommerce/classes/abstracts/abstract-wc-session.php on line 66”

I check the page in question but I didn’t edited it ever.
I can access the wp-admin page and when I click on Deactivate the woocomerce plugin the error disappears. The same thing happens when I delete the woocomerce files of the server.

I tried to update it, delete it and installing it again, all to now use.

THis page won’t work without the woocomerce plugin so I really need it to work as befor.

I would appreciate some help.