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', 'hhaqo3ud25dtsoh7auo8v86he4', '54.166.141.69', '1537381931', '1537381931', '/catalog/contact_us.php?osCsid=g6hccmqqmlkdons7a59puol9h4')

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