SQL-ERROR:
SELECT s.*, k1.name AS kat_name1, k2.name AS kat_name2, k3.name AS kat_name3 FROM shops AS s LEFT JOIN kategorien AS k1 ON s.kat_id1 = k1.id LEFT JOIN kategorien AS k2 ON s.kat_id2 = k2.id LEFT JOIN kategorien AS k3 ON s.kat_id3 = k3.id WHERE s.id = 108s LIMIT 1