diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index 430c193..34bc8f6 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/WaterJetting.cpp b/WaterJetting.cpp
index e5b2c81..e86d81f 100644
--- a/WaterJetting.cpp
+++ b/WaterJetting.cpp
@@ -1782,6 +1782,8 @@ WaterJetting::AddLeadInPreview( const ICurveComposite* pCompo, ISurfFlatRegion*
    double dSideCoeff = ( abs( m_Params.m_dSideAngle) > EPS_ANG_SMALL ? 1. / cos( m_Params.m_dSideAngle * DEGTORAD) : 1) ;
    double Rad = 0.49 * m_TParams.m_dDiam * dSideCoeff ;   // non 0.5 per evitare problemi di coincidenza
    pSfr.Set( GetSurfFlatRegionFromFatCurve( Release( pCrv), Rad, false, false)) ;
+   if ( IsNull( pSfr))
+      return false ;
   // se presente foro di attacco, ne calcolo la regione e la unisco alla precedente
    if ( m_Params.m_bLiHole  &&  m_Params.m_dLiHoleRad > 10 * EPS_SMALL) {
       PtrOwner<ISurfFlatRegion> pSfr2( GetSurfFlatRegionDisk( m_Params.m_dLiHoleRad + m_TParams.m_dDiam / 2))  ;
@@ -1791,7 +1793,7 @@ WaterJetting::AddLeadInPreview( const ICurveComposite* pCompo, ISurfFlatRegion*
       }
    }
   // Unisco le due regioni
-   return ( ! IsNull( pSfr)  &&  pSPV->Add( *pSfr)) ;
+   return ( pSPV->Add( *pSfr)) ;
 }
 
 //----------------------------------------------------------------------------