diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index 30609ba..82ca647 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/SurfTriMeshBooleans.cpp b/SurfTriMeshBooleans.cpp
index fa8698a..325019d 100644
--- a/SurfTriMeshBooleans.cpp
+++ b/SurfTriMeshBooleans.cpp
@@ -2508,6 +2508,10 @@ SurfTriMesh::GetSurfClassification( const ISurfTriMesh& ClassifierSurf,
    // Le superfici devono essere valide
    if ( ! IsValid()  ||  ! ClassifierSurf.IsValid())
       return false ;
+   if (  ClassifierSurf.GetVertexCount() == 0  ||  ClassifierSurf.GetTriangleCount() == 0)
+      return false ;
+   if ( m_vVert.empty()  ||  m_vTria.empty()) 
+      return true ;
    SurfTriMesh SurfC ;
    SurfC.CopyFrom( &ClassifierSurf) ;
    Frame3d frScalingRef ;