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', '3sc7eclrg1q854flvqc240g1h3', '34.239.176.198', '1619165035', '1619165035', '/')

[XT SQL Error]