From 8cc48c488f107473be46323a4ec949567d2ebe9b Mon Sep 17 00:00:00 2001
From: bgbsww <bgbsww@gmail.com>
Date: Thu, 9 Nov 2023 08:16:46 -0500
Subject: [PATCH] Defend against surface not created from invalid face

---
 src/Mod/Part/App/Tools.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Part/App/Tools.cpp b/src/Mod/Part/App/Tools.cpp
index 0463cf576a..b66da45f32 100644
--- a/src/Mod/Part/App/Tools.cpp
+++ b/src/Mod/Part/App/Tools.cpp
@@ -65,6 +65,7 @@
 # endif
 #endif
 
+#include <Base/Exception.h>
 #include <Base/Vector3D.h>
 
 #include "Tools.h"
@@ -640,8 +641,10 @@ Handle (Poly_Triangulation) Part::Tools::triangulationOfFace(const TopoDS_Face&
     selectRange(v1, v2);
 
     Handle(Geom_Surface) surface = BRep_Tool::Surface(face);
+    if ( surface.IsNull() ) {
+        FC_THROWM(Base::CADKernelError, "Cannot create surface from face");
+    }
     BRepBuilderAPI_MakeFace mkBuilder(surface, u1, u2, v1, v2, Precision::Confusion() );
-
     TopoDS_Shape shape = mkBuilder.Shape();
     shape.Location(loc);