Cannot edit posts after deleting Admin user

System Information
  • Strapi Version: 3.6.10
  • Database: Postgresql

After deleting an admin user, I can no longer edit posts previously created by this admin user.
This seems to happen only for collection types with relationships.

This is the error message I am receiving:

2022-08-17T13:56:18.232067+00:00 app[web.1]: [2022-08-17T13:56:18.231Z] error error: update “performances” set “organizer” = $1, “event” = $2, “created_by” = $3, “updated_by” = $4, “updated_at” = $5 where “id” = $6 returning * - invalid input syntax for type integer: “{}”