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', 'm9vud4diavftqccr0v9l0tg815', '54.80.96.153', '1537613782', '1537613782', '/catalog/product_info.php?products_id=879&osCsid=6mblkm1ovouoq14phqntgp4lh0')

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