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', '1sprifd52o1d1out040nqugag3', '3.145.164.105', '1746790900', '1746790900', '/xtshop/index.php')

[XT SQL Error]