Warning: array_filter() expects parameter 1 to be array, boolean given

When logged-in, at the top of my site’s front end I get:

Warning: array_filter() expects parameter 1 to be array, boolean given in /home/artthxsd/public_html/wp-content/plugins/woocommerce/includes/class-wc-cart.php on line 211

http://artthrob.co.za/

https://wordpress.org/plugins/woocommerce/