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', 'ada17ec3b75ee2ca306cc435adcd0914', '3.237.34.21', '1709267415', '1709267415', '/index.php/cat/c2_Honig-500-g.html')

[XT SQL Error]