pg_hashids extension - short uuid function not working

create extension pg_hashids with schema extensions;

CREATE OR REPLACE FUNCTION public.create_short_id("user_id_param" "uuid")
RETURNS "void"
    LANGUAGE plpgsql SECURITY DEFINER
    SET search_path = public, pg_temp
AS $$
BEGIN
    SELECT id
    FROM users
    WHERE id = user_id_param;

    INSERT INTO users(short_id)
    values (id_encode(id));
END;
$$;

select public.create_short_id(
  '94f24a59-63f6-4945-856b-18827694240b'::uuid
);

Error: Failed to run sql query: ERROR: 42601: query has no destination for result data HINT: If you want to discard the results of a SELECT, use PERFORM instead. CONTEXT: PL/pgSQL function create_short_id(uuid) line 3 at SQL statement