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', 's2k27u8s1bsqsgope39u5eein1', '54.166.130.157', '1540322306', '1540322306', '/catalog/login.php?osCsid=m8fov3mm6g9bt57v5ir3hida22')

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