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', '9op3vhbjeu4g1seumjal3bl753', '3.85.143.239', '1558355619', '1558355619', '/shop/product_info.php?info=p348_1-3--Kamera-SONY-Super-HAD-CCD-Kamera-520TVL-1-0-Lux.html')

[XT SQL Error]