diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index 0728a2d..f716c09 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/OffsetCurve.cpp b/OffsetCurve.cpp
index 4174930..3ac0419 100644
--- a/OffsetCurve.cpp
+++ b/OffsetCurve.cpp
@@ -372,6 +372,13 @@ OffsetCurve::Make( const ICurve* pCrv, double dDist, int nType)
    if ( ! m_CrvLst.empty())
       m_CrvLst.front()->GetStartPoint( ptPrec) ;
    for ( auto& pCrv : m_CrvLst) {
+     // se curva troppo piccola la salto
+      double dCrvLen ;
+      if ( ! pCrv->GetLength( dCrvLen)) {
+         delete( pCrv) ;
+         pCrv = nullptr ;
+         continue ;
+      }
      // se punto iniziale diverso da precedente, inserisco segmento di collegamento
       Point3d ptStart ;
       pCrv->GetStartPoint( ptStart) ;