From 86ce367ba84933177b9d5551c3166e59d442f2d6 Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Sun, 11 Jul 2021 09:28:22 +1000
Subject: [PATCH] Fix #1561.

---
 src/blenderbim/blenderbim/bim/export_ifc.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/blenderbim/blenderbim/bim/export_ifc.py b/src/blenderbim/blenderbim/bim/export_ifc.py
index 5f9b35812c..0732cbbbb7 100644
--- a/src/blenderbim/blenderbim/bim/export_ifc.py
+++ b/src/blenderbim/blenderbim/bim/export_ifc.py
@@ -68,6 +68,8 @@ class IfcExporter:
 
         for ifc_definition_id, obj in IfcStore.id_map.items():
             try:
+                if isinstance(obj, bpy.types.Material):
+                    continue
                 self.sync_object_placement(obj)
                 self.sync_object_container(ifc_definition_id, obj)
             except ReferenceError: