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', '0qavlvv9qihi630v12kn7e3uo0', '54.80.83.123', '1537837564', '1537837564', '/catalog/product_info.php?name=Zeta%20Phi%20Beta%20Large%20Mirror%20Greek%20Pin%20ZPB_LGPM&products_id=862')

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