This query make AV in engine

SELECT RDB$RELATION_ID,
       (WITH RECURSIVE
         NUM (ID) AS
         (
           SELECT 1 FROM RDB$DATABASE

           UNION ALL

           SELECT ID + 1
             FROM NUM
            WHERE ID < 10
         )
        SELECT MAX(ID) FROM NUM
       ) AS NNN
  FROM RDB$DATABASE
ORDER BY NNN


There is workaround. This query is equal and works ok :

WITH RECURSIVE
  NUM (ID) AS
  (
           SELECT 1 FROM RDB$DATABASE

           UNION ALL

           SELECT ID + 1
             FROM NUM
            WHERE ID < 10
  )
SELECT RDB$RELATION_ID, (SELECT MAX(ID) FROM NUM) AS NNN
  FROM RDB$DATABASE
ORDER BY NNN