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', 'idb6e243qai3009b3br1phie62', '54.198.212.30', '1539601160', '1539601160', '/catalog/product_info.php?products_id=374&osCsid=sqjturjhfvikq90kimlg92b1f1')

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