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', 't8h6f5eq9b2l15crv05flfksr2', '216.73.216.80', '1766352107', '1766352107', '/shop_content.php/coID/99/product/Links')

[XT SQL Error]