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', 'ntcr2k8ihj6h2jrkia5co53sm5', '216.73.216.124', '1767787730', '1767787730', '/index.php?cPath=5136_5021')

[XT SQL Error]