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', '8bu7uptle4ov5du3f5tlcraqe1', '54.156.39.245', '1539606806', '1539606806', '/catalog/product_info.php?name=Mason%20Auto%20Emblem%20-%20ASP&products_id=661')

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