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', 'igrin5do4agl6svekh5pbg8rt0', '3.12.34.36', '1746789987', '1746789987', '/product_info.php?info=p579_804756-Haeufelpflug-fuer-Einradhacke.html')

[XT SQL Error]