1366 - Incorrect integer value: '' for column `hbl_shop`.`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', 'dd2au53tuu9p4e7302voeqm370', '3.137.202.126', '1746967771', '1746967771', '/product_info.php?info=p548_805210-Oberofen-Edelstahl-mit-Waermetauscher--100-Liter.html')

[XT SQL Error]