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', 'kl6gagn24sc4cvlnuk0k4ht6l7', '54.198.55.167', '1539786025', '1539786025', '/catalog/product_info.php?products_id=975&osCsid=ms9278h4k02kkpg1d5t5uvjpq4')

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