1366 - Incorrect integer value: '' for column `mapshopatlogis`.`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', '4631a5ffbec9fa45382cb2d05243776d', '216.73.216.65', '1752608839', '1752608839', '/index.php/language/de/cat/c35_Countries.html/page/6')

[XT SQL Error]