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', '0af5e2sphfbku7okec5cognh87', '54.80.219.236', '1537718468', '1537718468', '/catalog/product_info.php?products_id=153&osCsid=ldmmitulveqlrrfac9gbbh8241')

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