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', '8otf2eqe1con8vapuudjl9e461', '54.80.83.123', '1537522083', '1537522083', '/catalog/login.php?osCsid=frhgmbl94tdpg08sbfh3pld090')

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