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', '1cc7038f51cae172b6c5479e2cf9a7c3', '34.229.119.29', '1594328725', '1594328725', '/')

[XT SQL Error]