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', '48okds60vm2ks8235ni2ru9rc4', '216.73.216.9', '1758284190', '1758284190', '/product_info.php?info=p38_804503-Elektrische-Getreidemuehle.html')

[XT SQL Error]