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', 'igbhc79bc71e267em8g8fucdi1', '54.162.239.233', '1537700738', '1537700738', '/catalog/contact_us.php?osCsid=v17caesblakbd7seglru4lpip3')

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