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', 'ns0mttpof9l7ntmp8erjjn48n0', '54.80.188.87', '1540123988', '1540123988', '/catalog/shopping_cart.php?osCsid=vbg52lp6mnuanqpfeqbse37uh1')

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