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', '1fsaj9cjrpqkbb49kc85m7l3q4', '54.158.208.189', '1539714680', '1539714680', '/catalog/default.php?cPath=46_126&osCsid=ineuieb3vsqku9qkhfkkcg1pi6')

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