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', '8ca7fb0046ae7d193cc620b8c6ba9f48', '18.118.120.204', '1714042008', '1714042008', '/index.php')

[XT SQL Error]