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', '80b0d7a1f6d5c976457f33b9c4c9a431', '3.138.102.178', '1714168599', '1714168599', '/index.php/cat/c1_Honig-250-g.html')

[XT SQL Error]