diff --git a/EXE_GeoInters.cpp b/EXE_GeoInters.cpp
index 5e75ed2..78ddb87 100644
--- a/EXE_GeoInters.cpp
+++ b/EXE_GeoInters.cpp
@@ -1020,16 +1020,22 @@ MyCurveCurveInters( const int nId1, const int nId2, const int nDestGrpId, int& n
       return GDB_ID_NULL ;
 
   // recupero le curve e le porto nel riferimento del gruppo di destinazione
-   PtrOwner<ICurve> pCrv1( GetCurve( pGeomDB->GetGeoObj( nId1))->Clone()) ;
-   if ( IsNull( pCrv1))
+   ICurve* pOrigCrv1 = GetCurve( pGeomDB->GetGeoObj( nId1)) ;
+   if ( pOrigCrv1 == nullptr)
+      return GDB_ID_NULL ;
+   PtrOwner<ICurve> pCrv1( pOrigCrv1->Clone()) ;
+   if( IsNull( pCrv1))
       return GDB_ID_NULL ;
    Frame3d frCrv1 ;
    if ( ! pGeomDB->GetGlobFrame( nId1, frCrv1))
       return GDB_ID_NULL ;
    pCrv1->LocToLoc( frCrv1, frDest) ;
 
-   PtrOwner<ICurve> pCrv2( GetCurve( pGeomDB->GetGeoObj( nId2))->Clone()) ;
-   if ( IsNull( pCrv2))
+   ICurve* pOrigCrv2 = GetCurve( pGeomDB->GetGeoObj( nId2)) ;
+   if ( pOrigCrv2 == nullptr)
+      return GDB_ID_NULL ;
+   PtrOwner<ICurve> pCrv2( pOrigCrv2->Clone()) ;
+   if( IsNull( pCrv2))
       return GDB_ID_NULL ;
    Frame3d frCrv2 ;
    if ( ! pGeomDB->GetGlobFrame( nId2, frCrv2))