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', 'r1lemmjvcmk2gd1vuofkbi5sq3', '3.16.188.113', '1746950745', '1746950745', '/product_info.php?info=p633_801991-Deckel-fuer-Elektro-Futterdaempfer-100-Liter.html')

[XT SQL Error]