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', '4c3416f2cc6eab7a9c41d69c4b9a473a', '216.73.216.35', '1751516751', '1751516751', '/index.php/cat/c19_Reliefkarten-Digital.html')

[XT SQL Error]