From 693206c2422b4a49bc284b3f43068dd6a6f99fb1 Mon Sep 17 00:00:00 2001
From: Laurent Rineau <laurent.rineau@cgal.org>
Date: Wed, 5 Jun 2024 17:02:13 +0200
Subject: [PATCH] fix the UBSAN error

```
include/CGAL/Poisson_reconstruction_function.h:263:70: runtime error: reference binding to null pointer of type 'struct value_type'
```
---
 .../include/CGAL/Poisson_reconstruction_function.h           | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Poisson_surface_reconstruction_3/include/CGAL/Poisson_reconstruction_function.h b/Poisson_surface_reconstruction_3/include/CGAL/Poisson_reconstruction_function.h
index 68c71a27151..ae2544567d7 100644
--- a/Poisson_surface_reconstruction_3/include/CGAL/Poisson_reconstruction_function.h
+++ b/Poisson_surface_reconstruction_3/include/CGAL/Poisson_reconstruction_function.h
@@ -260,7 +260,10 @@ class Poisson_reconstruction_function
 
     Cell_handle get() const
     {
-      return Triangulation_data_structure::Cell_range::s_iterator_to(*m_cell);
+      if(m_cell == nullptr)
+        return {};
+      else
+        return Triangulation_data_structure::Cell_range::s_iterator_to(*m_cell);
     }
     void set (Cell_handle ch) { m_cell = ch.operator->(); }
   };