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', 'h3ci4gvsu1thkvah7his8mifo2', '3.144.149.8', '1746783715', '1746783715', '/product_info.php?info=p58_800765-Splinte-fuer-Bauschubkarre.html')

[XT SQL Error]