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 'azoto'
OR F.tags LIKE 'ciclo dell'azoto,%'
...' at line 13
Query error.SELECT
F.user_ID,
F.ID,
F.trackback,
F.filename,
F.extension,
F.title
FROM fabcms_fabmedia AS F
LEFT JOIN fabcms_fabmedia_masters AS FMASTER
ON F.master_ID = FMASTER.ID
WHERE LENGTH(F.filename) > 0
AND LENGTH(F.extension) > 0 AND
(F.tags = 'ciclo dell'azoto'
OR F.tags LIKE 'ciclo dell'azoto,%'
OR F.tags LIKE '%,ciclo dell'azoto,'
OR F.tags LIKE '%,ciclo dell'azoto' OR F.tags = 'ciclo biogeochimico'
OR F.tags LIKE 'ciclo biogeochimico,%'
OR F.tags LIKE '%,ciclo biogeochimico,'
OR F.tags LIKE '%,ciclo biogeochimico' ) AND F.enabled = 1 AND F.ID != 638 LIMIT 6