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', 'f9kf9bnopc9r2nottb11na5j84', '54.225.26.44', '1539778602', '1539778602', '/catalog/product_info.php?name=SGRho%20signature%20Lapel%20Pin&products_id=159')

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