From 51f8877e60f5f37bd1c70bd4ce6b851f8ecf1c1a Mon Sep 17 00:00:00 2001
From: Maxime Gimeno <maxime.gimeno@gmail.com>
Date: Thu, 13 Dec 2018 09:17:46 +0100
Subject: [PATCH] Replace the assertion about n>2 by a if

---
 BGL/include/CGAL/boost/graph/Euler_operations.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/BGL/include/CGAL/boost/graph/Euler_operations.h b/BGL/include/CGAL/boost/graph/Euler_operations.h
index 1375e41c68a..04b415b207c 100644
--- a/BGL/include/CGAL/boost/graph/Euler_operations.h
+++ b/BGL/include/CGAL/boost/graph/Euler_operations.h
@@ -587,11 +587,14 @@ add_face(const VertexRange& vr, Graph& g)
   unsigned int n = (unsigned int)vertices.size();
   //check that every vertex is unique
   std::sort(vertices.begin(), vertices.end());
-  if(std::adjacent_find(vertices.begin(), vertices.end()) != vertices.end())
+  if(std::adjacent_find(vertices.begin(), vertices.end()) != vertices.end()){
     return boost::graph_traits<Graph>::null_face();
+  }
   std::copy(vr.begin(), vr.end(), vertices.begin());
   // don't allow degenerated faces
-  CGAL_assertion(n > 2);
+  if(n <= 2){
+    return boost::graph_traits<Graph>::null_face();
+  }
 
   std::vector<halfedge_descriptor> halfedges(n);
   std::vector<bool>                is_new(n);