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', '9698e8d032facdaa533696e2330752aa', '3.233.221.149', '1582241753', '1582241753', '/shop/index.php?cat=c90_Schn--ppchen.html')

[XT SQL Error]