1366 - Incorrect integer value: '' for column `abtecsho_shop`.`whos_online`.`customer_id` at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', '0plff7kc28d1jt83c12hkb24r0', '18.97.9.174', '1743164450', '1743164450', '/shop_content.php/coID/9/content/Zahlung')

[XT SQL Error]