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', 'hborr4kca9o5vp8v75f93nep96', '216.73.216.217', '1751523533', '1751523533', '/product_info.php?info=p662_806514-Geraetehalter--Hakenleiste.html')

[XT SQL Error]