Looks like you ran upgrade.sql twice.
If you do not have a database backup of 1.4.2, you can rollback database structure manually.
See https://github.com/abantecart/abantecart-src/blob/master/public_html/install/abantecart_database_upgrade.sql for details
If you do not have a database backup of 1.4.2, you can rollback database structure manually.
See https://github.com/abantecart/abantecart-src/blob/master/public_html/install/abantecart_database_upgrade.sql for details

