1366 - Incorrect integer value: '' for column `CP_as15`.`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', 'feps97kntf2a7k7gje4vvvtmp1', '18.188.42.190', '1739000686', '1739000686', '/index.php?XTCsid=o64jeukdqdg9btq7j80htrr7d3&cat=c1047_LiFePO4-Starterbatterien.html')

[XT SQL Error]