[Koha] Upgrading database schema for

Hi, I'm trying to update the database of an instance and it's showing the following error. koha-upgrade-schema library Upgrading database schema for library Upgrade to 21.06.00.012 [21:15:15]: Bug 15067 - Add missing languages ERROR - {UNKNOWN}: DBI Exception: DBD::mysql::db do failed: Duplicate entry 'AL-region' for key 'uniq_lang' at /usr/share/koha/lib/C4/Installer.pm line 738 How can I solve this?