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', 'ntp5a9k839u0p428177kladi92', '54.80.87.166', '1540312750', '1540312750', '/catalog/default.php?cPath=47_55&osCsid=lr8nsn9fefmkq735ptc0ln7ju0')

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