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', '5dfea2tig10gnbstp4e13fr075', '54.80.83.123', '1537525933', '1537525933', '/catalog/default.php?cPath=46_123&osCsid=ntc59ptq2njuj8p88lgnqd2jt5')

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