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', '3sjluttfmen6kpb9nlf77rro53', '18.97.14.81', '1752992868', '1752992868', '/shop_content.php/coID/3/content/Unsere-AGB-s')

[XT SQL Error]