Fatal Error in WooCommerce Log

Any idea what caused this error, or how to resolve it?

2020-04-17T16:34:46+00:00 CRITICAL Uncaught Error: Call to a member function get_tax_class() on null in /www/swiftink_629/public/wp-content/plugins/woocommerce/includes/class-wc-cart-totals.php:223
Stack trace:
#0 /www/swiftink_629/public/wp-content/plugins/woocommerce/includes/class-wc-cart-totals.php(650): WC_Cart_Totals->get_items_from_cart()
#1 /www/swiftink_629/public/wp-content/plugins/woocommerce/includes/class-wc-cart-totals.php(141): WC_Cart_Totals->calculate_item_totals()
#2 /www/swiftink_629/public/wp-content/plugins/woocommerce/includes/class-wc-cart-totals.php(132): WC_Cart_Totals->calculate()
#3 /www/swiftink_629/public/wp-content/plugins/woocommerce/includes/class-wc-cart.php(1237): WC_Cart_Totals->__construct(Object(WC_Cart))
#4 /www/swiftink_629/public/wp-content/plugins/woocommerce/includes/class-wc-cart.php(1196): WC_Cart->calculate_totals()
#5 /www/swiftink_629/public/wp-content/plugins/woocommerce-side-cart-premium/public/class-xoo-wsc-cart-data.php(130): WC_Cart->set_quantity(‘f5a14d4963acf48…’, 1)
#6 /www/swiftink_629/ in /www/swiftink_629/public/wp-content/plugins/woocommerce/includes/class-wc-cart-totals.php on line 223