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', 'f52cbf7e5ef7ee6542ca7d5273a9970e', '216.73.216.191', '1758193024', '1758193024', '/product_info.php/info/p2652_Spanien-Reliefkarte.html')

[XT SQL Error]