problem with latin09 encoding after upgrade to 11.3

Hey,

I’ve just upgraded from postgresql 11.2  to 11.3

postgres=# SELECT version(); 

                                                 version                                                

---------------------------------------------------------------------------------------------------------

PostgreSQL 11.3 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-36), 64-bit

Now the function to_char throws an error:

Standardumwandlung von Kodierung »LATIN1« nach »LATIN9« existiert nicht

The database  encoding is 'LATIN9', and all went fine until this new version, and latin1 isn’t used anywhere.

I use yum to manage the versions, but I also can’t  downgrade the version!

Is there anything, I can do??

Regards

Monika