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', '715k5h9u5563m8bve65gqairt0', '54.166.141.69', '1537383960', '1537383960', '/catalog/default.php?cPath=52&osCsid=cagvnfvhvhqqe64dmoc1vq80g4')

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