Błąd bazy danych WordPressa: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 5]
SELECT id FROM mnr_kategorie_nosnikow WHERE parent_id=

Błąd bazy danych WordPressa: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 5]
SELECT COUNT(1) as c FROM mnr_nosniki WHERE id_kategorii IN (-1, )