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', 'h6kn8a8761ver0jqfvaem0e5l2', '54.92.164.184', '1537967129', '1537967129', '/catalog/product_info.php?name=Eastern%20Star%20Plastic%20License%20Plate%20Holder%20-%20PFW_4120&products_id=690')

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