diff --git a/src/bonsai/bonsai/bim/module/project/operator.py b/src/bonsai/bonsai/bim/module/project/operator.py
index caff816278..caf57879e2 100644
--- a/src/bonsai/bonsai/bim/module/project/operator.py
+++ b/src/bonsai/bonsai/bim/module/project/operator.py
@@ -1712,7 +1712,7 @@ class LoadLinkedProject(bpy.types.Operator):
         mesh.polygons.foreach_set("loop_total", loop_total)
         mesh.polygons.foreach_set("use_smooth", [0] * total_faces)
 
-        if material_ids.size > 0:
+        if material_ids.size > 0 and len(mesh.polygons) == len(material_ids):
             mesh.polygons.foreach_set("material_index", material_ids)
 
         mesh.update()
diff --git a/src/ifcpatch/ifcpatch/recipes/ExtractPropertiesToSQLite.py b/src/ifcpatch/ifcpatch/recipes/ExtractPropertiesToSQLite.py
index 3b7f49de9c..f9fdc9727a 100644
--- a/src/ifcpatch/ifcpatch/recipes/ExtractPropertiesToSQLite.py
+++ b/src/ifcpatch/ifcpatch/recipes/ExtractPropertiesToSQLite.py
@@ -136,21 +136,21 @@ class Patcher:
                 if material.is_a("IfcMaterial"):
                     materials = []
                 elif material.is_a("IfcMaterialLayerSet"):
-                    for idx, item in enumerate(material.MaterialLayers):
+                    for idx, item in enumerate(material.MaterialLayers or []):
                         material = item.Material
                         properties.append([i, "IFC Material", f"Layer {idx + 1} Name", getattr(item, "Name", None)])
                         properties.append([i, "IFC Material", f"Layer {idx + 1} Material", material.Name])
                         if category := getattr(material, "Category", None):
                             properties.append([i, "IFC Material", f"Layer {idx + 1} Category", category])
                 elif material.is_a("IfcMaterialProfileSet"):
-                    for idx, item in enumerate(material.MaterialProfiles):
+                    for idx, item in enumerate(material.MaterialProfiles or []):
                         material = item.Material
                         properties.append([i, "IFC Material", f"Profile {idx + 1} Name", item.Name])
                         properties.append([i, "IFC Material", f"Profile {idx + 1} Material", material.Name])
                         if category := getattr(material, "Category", None):
                             properties.append([i, "IFC Material", f"Profile {idx + 1} Category", category])
                 elif material.is_a("IfcMaterialConstituentSet"):
-                    for idx, item in enumerate(material.MaterialConstituents):
+                    for idx, item in enumerate(material.MaterialConstituents or []):
                         material = item.Material
                         properties.append([i, "IFC Material", f"Constituent {idx + 1} Name", item.Name])
                         properties.append([i, "IFC Material", f"Constituent {idx + 1} Material", material.Name])