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', 'ki4tfateaqs4lhl2a2khi8k0u5', '54.161.116.225', '1539911590', '1539911590', '/catalog/shopping_cart.php?osCsid=sr5o8tjo5k1obhun75a1thde94')

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