1366 - Incorrect integer value: '' for column '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', 'a42559927e5cf8cda0d1518bd250a2ca', '13.58.247.31', '1714123631', '1714123631', '/product_info.php/info/p18_Bluete-Heidehonig.html')

[XT SQL Error]