1366 - Incorrect integer value: '' for column `hbl_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', '31m0c7lbvu1bodhuhpupegfsp3', '216.73.216.162', '1762546581', '1762546581', '/index.php?cat=c43_Stall--und-Hofbedarf.html')

[XT SQL Error]