Fatal error: Uncaught TypeError: method_exists(): Argument #1 ($object_or_class) must be of type object|string, null given in /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/wp-content/plugins/booked-woocommerce-payments/lib/woocommerce/class-wc-cart.php:284 Stack trace: #0 /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/wp-content/plugins/booked-woocommerce-payments/lib/woocommerce/class-wc-cart.php(284): method_exists(NULL, 'remove_cart_ite...') #1 /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/wp-includes/class-wp-hook.php(288): Booked_WC_Cart_Hooks::woocommerce_remove_missing_appointment_products('') #2 /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array) #3 /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #4 /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/wp-settings.php(545): do_action('wp_loaded') #5 /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/wp-config.php(90): require_once('/is/htdocs/wp13...') #6 /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/wp-load.php(37): require_once('/is/htdocs/wp13...') #7 /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/wp-blog-header.php(13): require_once('/is/htdocs/wp13...') #8 /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/index.php(17): require('/is/htdocs/wp13...') #9 {main} thrown in /is/htdocs/wp13224250_ZVWYXA2OJX/maiati.de/wp-content/plugins/booked-woocommerce-payments/lib/woocommerce/class-wc-cart.php on line 284