From 6fb05fa7434431d710f28f529f10af588daf8f48 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Mon, 10 Jun 2024 21:40:39 +0200
Subject: [PATCH] Fix segfault on grid placement. Don't fail on nullptr
 transformation. #4832

---
 src/ifcgeom/IfcGeomElement.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/ifcgeom/IfcGeomElement.h b/src/ifcgeom/IfcGeomElement.h
index 14c321f620..698966d2d7 100644
--- a/src/ifcgeom/IfcGeomElement.h
+++ b/src/ifcgeom/IfcGeomElement.h
@@ -42,7 +42,13 @@ namespace IfcGeom {
 			: settings_(settings)
 			, matrix_(matrix)
 		{}
-		const ifcopenshell::geometry::taxonomy::matrix4::ptr& data() const { return matrix_; }
+		const ifcopenshell::geometry::taxonomy::matrix4::ptr& data() const {
+			if (matrix_) {
+				return matrix_;
+			}
+			static ifcopenshell::geometry::taxonomy::matrix4::ptr iden = ifcopenshell::geometry::taxonomy::make<ifcopenshell::geometry::taxonomy::matrix4>();
+			return iden;
+		}
 	};
 
 	class Element {