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', 'd56980a08e6a2fea1879d99ae14d9594', '13.59.218.147', '1714114705', '1714114705', '/index.php')

[XT SQL Error]