From bc7527a73bf61f06b63ff75d36bde42a42a4fb4b Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Wed, 30 Apr 2025 20:43:27 +0200
Subject: [PATCH] Defensiveness against empty faces

---
 src/ifcgeom/kernels/opencascade/sweep_along_curve.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ifcgeom/kernels/opencascade/sweep_along_curve.cpp b/src/ifcgeom/kernels/opencascade/sweep_along_curve.cpp
index 33c123cb68..cabbfc8ec6 100644
--- a/src/ifcgeom/kernels/opencascade/sweep_along_curve.cpp
+++ b/src/ifcgeom/kernels/opencascade/sweep_along_curve.cpp
@@ -231,6 +231,9 @@ bool OpenCascadeKernel::convert(const taxonomy::sweep_along_curve::ptr scs, Topo
 			} else {
 				f0 = BRepBuilderAPI_MakeFace(w0).Face();
 				f1 = BRepBuilderAPI_MakeFace(w1).Face();
+				if (f0.IsNull() || f1.IsNull()) {
+					return false;
+				}
 				mf0.reset(new BRepBuilderAPI_MakeFace(f0));
 				mf1.reset(new BRepBuilderAPI_MakeFace(f1));
 			}