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', 'q2lfp55m8tbne4ecse878v13i1', '3.236.212.116', '1632146160', '1632146160', '/')

[XT SQL Error]