Sorry for the inconvenience but we have fixed this compatibility issue.
Please check our theme changelog: https://themeforest.net/item/porto-responsive-wordpress-ecommerce-theme/9207399#item-description__change_logs
Please update the theme and core plugin again manually by redownloading from Themeforest and it will solve your issue.
Please try to update the theme and porto functionality plugin via FTP or Cpanel. https://www.portotheme.com/wordpress/porto/documentation/update-theme/