Check in the database, in the ps_meta table, that there are not 2 times, or something like that, and for one of the ids, that you have no data in ps_meta_lang.
Check in the database, in the ps_meta table, that there are not 2 times, or something like that, and for one of the ids, that you have no data in ps_meta_lang.
If you have added it again, go to the database (ps_meta table) and manually set it to id 2 as it was before.
If you have added it again, go to the database and manually set it to id 2 as it was before.