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', 'dkmo5ecuh6gg5l16m3mdf1d7h0', '54.162.171.242', '1534366701', '1534366701', '/catalog/default.php?cPath=52_188&osCsid=dfdm6bjp57fo37le0fabfdmvc4')

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