diff --git a/vcg/complex/algorithms/parametrization/uv_utils.h b/vcg/complex/algorithms/parametrization/uv_utils.h
index 2e2d271a..96d1a9e0 100644
--- a/vcg/complex/algorithms/parametrization/uv_utils.h
+++ b/vcg/complex/algorithms/parametrization/uv_utils.h
@@ -126,6 +126,9 @@ namespace vcg {
 							VertexType *v0=(*fi).V(0);
 							VertexType *v1=(*fi).V1(0);
 							VertexType *v2=(*fi).V2(0);
+                            assert(v0!=v1);
+                            assert(v1!=v2);
+                            assert(v0!=v2);
 							UVCoordType uv1=v1->T().P();
 							UVCoordType uv2=v2->T().P();
 							int index=v0-&(m.vert[0]);
@@ -138,6 +141,7 @@ namespace vcg {
 					for (int i=0;i<m.vert.size();i++)
 					{
 						if ((fix_borders)&&(m.vert[i].IsB()))continue;
+                        if (num[i]==0)continue;
 						m.vert[i].T().P()=UVpos[i]/(ScalarType)num[i];
 					}
 				}