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', 'vfd3frq0bnt805j34gdmv374l6', '54.80.96.153', '1537787068', '1537787068', '/catalog/product_info.php?name=Mason%20Plastic%20License%20Plate%20Holder%20-%20PFB_4010&products_id=659')

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