PostgreSQL: column t.relhasoids does not exist

I'm suddenly getting this error when trying to synchronize a Postgres database in RubyMine:

Error encountered when performing Introspect database xyz_development schema public (details): ERROR: column t.relhasoids does not exist
  Position: 135.
ERROR: column t.relhasoids does not exist
  Position: 135 (195 ms)

This seems to have started after I upgraded to Postgres 12.3 (from version 11) - though I never saw the error until I dropped and recreated the database.

I'm using RubyMine 2018.2.6. I don't have any problems connecting to the database using psql or Postico.