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', '4pjjhmi6go39chaaltte1fj351', '54.224.108.238', '1534533875', '1534533875', '/catalog/product_info.php?name=Mason%20License%20Plate%20-%20STSBG&products_id=645')

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