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', '1l9acp40t3d03i84u8o60hmd64', '54.80.93.19', '1534560131', '1534560131', '/catalog/default.php?cPath=51_250&osCsid=f9lrctcqi8ucu09vbfdvpllsq0')

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