Internal Server Error 500

After upgrading to 1.3.1 I got a blank screen.
Wget told me Internal Server Error 500 and I could not access any admin stuff or anythning else.

Solution: Somehow the upgrade moves the postgres-plug-in folder from
wp-content/plugins/pg4wp
to
wp-content/plugins/postgresql-for-wordpress/pg4wp

I moved it back and all seems to work again.

https://www.ads-software.com/plugins/postgresql-for-wordpress/