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', 'p2fg4u2cgpcpv019489pd33744', '54.198.23.251', '1537415027', '1537415027', '/catalog/product_info.php?name=Delta%20Sigma%20Theta%20Medallion%20-%20DELTA_WMED&products_id=474')

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