From f54c47bac6bd989dbbf808f3ae78ca2284e9b705 Mon Sep 17 00:00:00 2001
From: Christopher Lackner <clackner@cerbsim.com>
Date: Tue, 19 Nov 2019 10:00:05 +0100
Subject: [PATCH] if tangent is not defined and not checked this leads to
 segfault

---
 libsrc/occ/occgenmesh.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libsrc/occ/occgenmesh.cpp b/libsrc/occ/occgenmesh.cpp
index 8b00b684..9a714f8c 100644
--- a/libsrc/occ/occgenmesh.cpp
+++ b/libsrc/occ/occgenmesh.cpp
@@ -1110,7 +1110,9 @@ namespace netgen
               {
                 double s = s0 + j/(double) nsections * (s1-s0);
                 prop.SetParameter (s);
-                double curvature = prop.Curvature();
+                double curvature = 0;
+                if(prop.IsTangentDefined())
+                  curvature = prop.Curvature();
                 if(curvature> maxcur) maxcur = curvature;
 
                 if (curvature >= 1e99)