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', '8bbhg34e3k9vvr5d6q1sf6ik57', '54.158.208.189', '1539629283', '1539629283', '/catalog/default.php?cPath=52_190&osCsid=ptd3dfplmntfd0dbk4ir0bk922')

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