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', 'tdfj3ghbnvsa7a2n2b1pgll002', '54.198.142.121', '1537915987', '1537915987', '/catalog/product_info.php?products_id=977&osCsid=k7mjr6bt24m64uhttkfjk967f3')

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