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', 'u56a8lun3aqmm5fk787pamdkl5', '54.225.26.44', '1539774920', '1539774920', '/catalog/shopping_cart.php?osCsid=ssoa697mb3n0alhgir1glrtpp4')

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