1366 - Incorrect integer value: '' for column `CP_as15`.`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', 'o6m8f6ps4jcs2a4lvnme5hvgm4', '3.139.58.206', '1738998785', '1738998785', '/index.php?XTCsid=8e9c41f9ih262sbjeph8l1hut4&cat=c641_Ladeger--te.html')

[XT SQL Error]