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', '52d4613c219133fba1b2c385ddc9a6d4', '18.117.216.229', '1714082698', '1714082698', '/index.php/cat/c2_Honig-500-g.html')

[XT SQL Error]