1366 - Incorrect integer value: '' for column `agentur`.`whos_online`.`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', 'b0p51hqfa6ip4ns4078bv8u856', '3.238.147.211', '1606655875', '1606655875', '/')

[XT SQL Error]