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', '3hknnndoln1s1fb6oujd7apik2', '54.80.219.236', '1537452552', '1537452552', '/catalog/default.php?cPath=49_258&osCsid=6mblkm1ovouoq14phqntgp4lh0')

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