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', 'fb623144e6d4adf01e8b3137b1298f01', '3.138.69.153', '1722061939', '1722061939', '/index.php/cat/c2_Honig-500-g.html')

[XT SQL Error]