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', '8dvsb6lfvche7p0sfklqoupfb2', '54.166.203.17', '1537679631', '1537679631', '/catalog/allprods.php?osCsid=tgj5p8qje33s4i6adtfv208as4')

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