From 3fd472549e58435e187d5b0e418733ff9a76c7e6 Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Mon, 18 Jul 2022 10:29:32 +1000
Subject: [PATCH] Fix bug where material categories don't exist in IFC2X3

---
 src/blenderbim/blenderbim/tool/material.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/blenderbim/blenderbim/tool/material.py b/src/blenderbim/blenderbim/tool/material.py
index 42d70eb35d..617a8592d6 100644
--- a/src/blenderbim/blenderbim/tool/material.py
+++ b/src/blenderbim/blenderbim/tool/material.py
@@ -65,7 +65,7 @@ class Material(blenderbim.core.tool.Material):
         materials = sorted(tool.Ifc.get().by_type(material_type), key=get_name)
         categories = {}
         if material_type == "IfcMaterial":
-            [categories.setdefault(m.Category, []).append(m) for m in materials]
+            [categories.setdefault(getattr(m, "Category", "Uncategorised"), []).append(m) for m in materials]
             for category, mats in categories.items():
                 cat = props.materials.add()
                 cat.name = category or ""