diff --git a/SurfTriMeshUtilities.cpp b/SurfTriMeshUtilities.cpp
index 3d6cea2..c09cf0a 100644
--- a/SurfTriMeshUtilities.cpp
+++ b/SurfTriMeshUtilities.cpp
@@ -254,6 +254,9 @@ SurfTriMesh::RemoveTJunctions( bool& bModified)
 static bool
 IsVertex( PNTULIST& PointList, PNTULIST::const_iterator itCurr)
 {
+  // se la lista contiene meno di tre punti, test inutili
+   if ( PointList.size() < 3)
+      return false ;
   // recupero il punto precedente
    PNTULIST::const_iterator itPrev ;
    if ( itCurr == PointList.cbegin())