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', 'uoq55t1bcr3d0hklhnrmrtd7h4', '54.156.39.245', '1540219269', '1540219269', '/catalog/product_notifications.php?osCsid=of6j5v6232eqgemhf7v7vsalr7')

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