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', '5osqn0j92k8tckee6h0munq452', '54.80.188.87', '1540124235', '1540124235', '/catalog/default.php?cPath=47_240&osCsid=dd67tpab021tqla2ugp4prl9g4')

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