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', 'crk00ltbt1c6kav5amaa2dcd55', '2600:1f28:365:80b0:36bf:af88:36d3:5592', '1775833927', '1775833927', '/')

[XT SQL Error]