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', '8vt06ms8v56bcs26u261d2odn5', '3.145.40.165', '1738998495', '1738998495', '/index.php?XTCsid=nj57khd41hu8ciniagj0kmvlc3&cat=c1047_LiFePO4-Starterbatterien.html')

[XT SQL Error]