1366 - Incorrect integer value: '' for column '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', 'g5dqct8slov309ls01srnntc02', '54.224.247.42', '1540200635', '1540200635', '/catalog/default.php?cPath=51&osCsid=9751euflil85qb17cgr25p82p7')

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