From aef00a4dfc44b5d361634d3379d2369945eeac61 Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Mon, 4 Mar 2024 17:53:36 +1100
Subject: [PATCH] See #4389. Accommodate null pset values when serializing to
 SVG.

---
 src/serializers/SvgSerializer.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/serializers/SvgSerializer.cpp b/src/serializers/SvgSerializer.cpp
index 5bed15d1da..cef46ee05c 100644
--- a/src/serializers/SvgSerializer.cpp
+++ b/src/serializers/SvgSerializer.cpp
@@ -493,6 +493,9 @@ namespace {
 				for (auto& prop : *props) {
 					if (prop->declaration().is("IfcPropertySingleValue")) {
 						std::string name = *((IfcUtil::IfcBaseEntity*) prop)->get("Name");
+                        if (((IfcUtil::IfcBaseEntity*) prop)->get("NominalValue")->isNull()) {
+                            continue;
+                        }
 						IfcUtil::IfcBaseClass* v = *((IfcUtil::IfcBaseEntity*) prop)->get("NominalValue");
 						auto value = v->data().getArgument(0);
 						if (value->type() == IfcUtil::Argument_STRING) {