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', 'keend1ebf41ft6ik9hlgsm4dm6', '54.80.83.123', '1537837976', '1537837976', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20Graduation%20Stole%2098450&products_id=836')

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