Fatal error: Uncaught Error: Call to a member function validate() on null in /homepages/33/d90197028/htdocs/wp-content/plugins/woocommerce-product-addons/includes/class-product-addon-cart.php:255 Stack trace: #0 /homepages/33/d90197028/htdocs/wp-includes/class-wp-hook.php(286): Product_Addon_Cart->validate_add_cart_item(true, 20952, 1) #1 /homepages/33/d90197028/htdocs/wp-includes/plugin.php(208): WP_Hook->apply_filters(true, Array) #2 /homepages/33/d90197028/htdocs/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(776): apply_filters('woocommerce_add...', true, 20952, 1) #3 /homepages/33/d90197028/htdocs/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(750): WC_Form_Handler::add_to_cart_handler_simple(20952) #4 /homepages/33/d90197028/htdocs/wp-includes/class-wp-hook.php(286): WC_Form_Handler::add_to_cart_action('') #5 /homepages/33/d90197028/htdocs/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #6 /homepages/33/d90197028/htdocs/wp-includes/plugin.php(465): WP_Hoo in /homepages/33/d90197028/htdocs/wp-content/plugins/woocommerce-product-addons/includes/class-product-addon-cart.php on line 255