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', '857iom8mphh6ko1fek3mib5vk2', '54.198.212.30', '1539857381', '1539857381', '/catalog/product_info.php?products_id=876&osCsid=f5vccsn7bfo98ddkk2pm3b4tl5')

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