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', '1l26acu80dv2i5amlj9saop1u5', '18.218.145.54', '1746871864', '1746871864', '/product_info.php?info=p94_800567-Walze-extrafein-fuer-Tisch---Ruebenmuehle.html')

[XT SQL Error]