1366 - Incorrect integer value: '' for column `hundgesund`.`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', '3a4e3afafa98ac3a12529510010dd9ca', '3.233.221.149', '1582244735', '1582244735', '/shop/index.php?cat=c108_Guntersdorfer-Fanshop.html')

[XT SQL Error]