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', '8brbhf4tcr337mfn8kt66gse62', '52.15.154.142', '1746788794', '1746788794', '/shop_content.php/coID/1/content/Versandkosten')

[XT SQL Error]