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', 'vvs0d8tsdgvarr9l4cb69o6i52', '54.161.100.24', '1539670025', '1539670025', '/catalog/product_info.php?products_id=435&osCsid=066d8av7c5s3e7d68m13fvbi91')

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