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', 'ptcrtmdrq9ek18suffl9tcbto4', '54.162.239.233', '1537822401', '1537822401', '/catalog/shopping_cart.php?osCsid=40bi3t9mvqs497bakr776j3df7')

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