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', 'vvqp9fa6oge467m4nncd2b1jc3', '54.158.208.189', '1539716246', '1539716246', '/catalog/default.php?cPath=50&osCsid=98gmlsljt33rt1727osgke44l6')

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