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', 'e9b038f55ead992e0b4550cfcf8ea1db', '3.237.34.21', '1709264089', '1709264089', '/index.php/cat/c1_Honig-250-g.html')

[XT SQL Error]