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', '7oh1u23scketo4odhckm8sgmm2', '54.225.26.44', '1539775186', '1539775186', '/catalog/default.php?cPath=56_63&osCsid=mpf5rs1o6rdvmnf89i844k9u07')

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