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', '1r3v0u9tfg5tnmglrbjsg0ie27', '216.73.216.47', '1758207828', '1758207828', '/product_info.php?info=p41_Brutautomat-MINI.html')

[XT SQL Error]