Hi Alex,
The current supported version of WooCommerce is 3.1.2 (more info: https://archived.seventhqueen.com/kleo).
You should roll back your version of WooCommerce to 3.1.2 from 3.3.X until an update is released, or, if your cart, products and archives are working as expected you can turn off error printing on the front end by adding the below to your wp-config.php file
COPY CODE
ini_set('display_errors','Off');
ini_set('error_reporting', E_ALL );
define('WP_DEBUG', true);
define('WP_DEBUG_DISPLAY', false);
See here for more information http://www.wpbeginner.com/wp-tutorials/how-to-turn-off-php-errors-in-wordpress/
Source for WooCommerce version 3.1.2 https://downloads.wordpress.org/plugin/woocommerce.3.1.2.zip
Thanks,
Kieran
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