From 0596827b9d0c9271f1a56a6fe2c6f987089107ff Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Thu, 9 Mar 2017 15:04:54 +0100
Subject: [PATCH] Fix null pointer access in tesselation of opencascade shape

---
 src/ifcgeom/kernels/opencascade/OpenCascadeShape.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ifcgeom/kernels/opencascade/OpenCascadeShape.cpp b/src/ifcgeom/kernels/opencascade/OpenCascadeShape.cpp
index fcc94b52e3..da31ee08b9 100644
--- a/src/ifcgeom/kernels/opencascade/OpenCascadeShape.cpp
+++ b/src/ifcgeom/kernels/opencascade/OpenCascadeShape.cpp
@@ -11,7 +11,10 @@
 void IfcGeom::OpenCascadeShape::Triangulate(const IfcGeom::IteratorSettings& settings, const IfcGeom::ConversionResultPlacement* place, IfcGeom::Representation::Triangulation<double>* t, int surface_style_id) const {
 
 	const TopoDS_Shape& s = shape_;
-	const gp_GTrsf& trsf = dynamic_cast<const OpenCascadePlacement*>(place)->trsf();
+	gp_GTrsf trsf;
+	if (place) {
+		trsf = dynamic_cast<const OpenCascadePlacement*>(place)->trsf();
+	}
 
 	// Triangulate the shape
 	try {