From e2aa646b0e43a3a7044fde0caa599c7c6a435c6b Mon Sep 17 00:00:00 2001
From: Christopher Lackner <clackner@cerbsim.com>
Date: Mon, 9 Oct 2023 11:50:18 +0200
Subject: [PATCH] allow read in of "broken" step files (for manual fixing)

---
 libsrc/occ/occgeom.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libsrc/occ/occgeom.cpp b/libsrc/occ/occgeom.cpp
index ee1bc139..b930da48 100644
--- a/libsrc/occ/occgeom.cpp
+++ b/libsrc/occ/occgeom.cpp
@@ -1166,6 +1166,8 @@ namespace netgen
           auto e = emap(i1);
           auto edge = TopoDS::Edge(e);
           auto verts = GetVertices(e);
+          if(verts.size() == 0)
+            continue;
           auto occ_edge = make_unique<OCCEdge>(edge, GetVertex(verts[0]), GetVertex(verts[1]) );
           occ_edge->properties = GetProperties(e);
           edges.Append(std::move(occ_edge));