error: Zugriffsverletzung bei Adresse 01D6FED0 in Modul 'gk2.dll'. Lesen von Adresse 00000000

database: datenbanken\gartenhof-kuesters2.de\pictures.GDB
table: picture A join pictureobject B on A.object=B.id join picturetyp C on C.id=A.typ join zo_category_pictureobject D on D.pictureobject=B.id
sqlstring: Select count(DISTINCT A.id) from picture A join pictureobject B on A.object=B.id join picturetyp C on C.id=A.typ join zo_category_pictureobject D on D.pictureobject=B.id Where (D.category=148) and (A.object=4854) and (B.visible=1)