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', 'o5i3drup8ootjc3qsjoj72muk5', '54.156.39.245', '1540217347', '1540217347', '/catalog/default.php?cPath=54_255&osCsid=tbe1d72verucdldngt8498ska1')

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