E_Error whenever WC()->cart->get_cart() is called

Hi,

Every day, the website will email me this once, the code works and I can’t figure out what the “trigger” is, the line it complains about looks fine to me, I can’t understand what it’s trying to say!

Any help would be appreciated:

Error Details
=============
An error of type E_ERROR was caused in line 48 of the file /wp-content/plugins/side-cart-woocommerce/public/class-xoo-wsc-cart-data.php. Error message: Uncaught Error: Call to a member function get_cart() on null in /wp-content/plugins/side-cart-woocommerce/public/class-xoo-wsc-cart-data.php:48
Stack trace:
#0 /wp-includes/class-wp-hook.php(286): xoo_wsc_Cart_Data->get_cart_content('')
#1 /wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters('', Array)
#2 /wp-includes/plugin.php(465): WP_Hook->do_action(Array)
#3 /wp-content/plugins/side-cart-woocommerce/public/partials/xoo-wsc-markup.php(68): do_action('xoo_wsc_cart_co...')
#4 /wp-content/plugins/side-cart-woocommerce/public/class-xoo-wsc-cart-data.php(37): require_once('/var/www/vhosts...')
#5 /wp-includes/class-wp-hook.php(286): xoo_wsc_Cart_Data->get_cart_markup('')

Kind Regards