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', 'dhphiuhnm78p857ljku6r74536', '54.158.208.189', '1539632680', '1539632680', '/catalog/default.php?cPath=29_236&osCsid=8erko6u1fv9rgeh1gnu5lcf6k1')

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