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', 'dkfciq22113c3beqt33jj7lg73', '216.73.216.47', '1758000239', '1758000239', '/product_info.php?info=p654_806071-Reihenzieher-Furchenzieher--50-cm.html')

[XT SQL Error]