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', '6e2f059cbf5aa82c47f3325b35aa1dcc', '216.73.216.8', '1758077284', '1758077284', '/index.php/language/en/cat/c8_Reliefkarten-Poster.html')

[XT SQL Error]