1366 - Incorrect integer value: '' for column `hollen`.`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, http_referer) values ('', 'Guest', 'p0bdcg49r3f07183sfm2c9rbo6', '34.239.179.228', '1623726772', '1623726772', '/', 'Keiner/None')

[XT SQL Error]