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', '7lc7k42eluu0ch0iuhur5438p4', '216.73.216.30', '1751757972', '1751757972', '/product_info.php?info=p525_800154-Einsatz-fuer-200-Liter-Futterdaempfer--vollverzinkt-.html')

[XT SQL Error]