1366 - Incorrect integer value: '' for column `argus_xtc`.`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', 'd9r398l63k98oaiiauqlqngsm3', '18.215.161.19', '1560710418', '1560710418', '/shop/index.php?cat=c17_Au-enschutzgehaeuse.html')

[XT SQL Error]