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', 'bdc72coj20ifh12tdvdn0khle2', '54.158.208.189', '1539632964', '1539632964', '/catalog/password_forgotten.php?osCsid=kc6j4t0tgd47bt4653h5mbiob0')

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