Vergleich install/resources/pgsql_db_tables.php - 1.8.29 - 1.8.31

$query = $db->write_query("SELECT column_name
						  FROM information_schema.constraint_column_usage
						  WHERE table_name = '".$config['tableprefix']."userfields'
						  AND constraint_name = '".$config['tableprefix']."userfields_pkey'
						  LIMIT 1");
$main_field = $db->fetch_field($query, 'column_name');
if(!empty($main_field))
{
	$tables[] = "DROP SEQUENCE mybb_userfields_ufid_seq;";
}