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', 'oa91b299jeqidqja9ed9ok3nm5', '3.145.46.212', '1738997945', '1738997945', '/index.php?XTCsid=mkl8qqqorbnshicuaf45rnrdo2&cat=c31_Batterien.html')

[XT SQL Error]