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', '6nu8vdc5edgppena287fku7ue5', '3.23.85.47', '1738998605', '1738998605', '/index.php?XTCsid=rvhpma4g2refpn33qk2f07nfb7&cat=c672_Tablet-PC---E-Book-Akku.html')

[XT SQL Error]