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', '67lf6mjugj0pvr56c1o64tbsq1', '54.196.42.8', '1534400152', '1534400152', '/catalog/product_info.php?name=Mason%20graduation%20Stole%2090408&products_id=840')

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