HIBA:
You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'AND m.title>'' ORDER BY i.ord_index' at line 1

SQL:

SELECT i.id AS id, title, v.virtlink AS virtlink FROM issues AS i LEFT JOIN issues_mutations AS m ON (m.issue_id=i.id AND m.lang='hu') LEFT JOIN virtlinks AS v ON (v.issue_id=i.id AND v.lang='hu') WHERE i.parent_id= AND m.title>'' ORDER BY i.ord_index