Fatal error: Uncaught Error: Call to a member function add_to_cart() on null in /customers/0/9/b/abc-event.dk/httpd.www/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php:842
Stack trace:
#0 /customers/0/9/b/abc-event.dk/httpd.www/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(814): WC_Form_Handler::add_to_cart_handler_simple(2529)
#1 /customers/0/9/b/abc-event.dk/httpd.www/wp-includes/class-wp-hook.php(324): WC_Form_Handler::add_to_cart_action('')
#2 /customers/0/9/b/abc-event.dk/httpd.www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#3 /customers/0/9/b/abc-event.dk/httpd.www/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#4 /customers/0/9/b/abc-event.dk/httpd.www/wp-settings.php(717): do_action('wp_loaded')
#5 /customers/0/9/b/abc-event.dk/httpd.www/wp-config.php(103): require_once('/customers/0/9/...')
#6 /customers/0/9/b/abc-event.dk/httpd.www/wp-load.php(50): require_once('/customers/0/9/...')
#7 /customers/0/9/b/abc-event.dk/httpd.www/wp-blog-header.php(13): require_once('/customers/0/9/...')
#8 /customers/0/9/b/abc-event.dk/httpd.www/index.php(17): require('/customers/0/9/...')
#9 {main}
  thrown in /customers/0/9/b/abc-event.dk/httpd.www/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php on line 842