1366 - Incorrect integer value: '' for column `shop_db3`.`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', '8abd82a8013a1d4404164dc707364663', '3.145.60.149', '1713484522', '1713484522', '/product_info.php?language=de&info=p247_Nessun-Dorma.html&XTCsid=a30b88a4b439ebf54b931b21d14e2df9')

[XT SQL Error]