diff --git a/src/bonsai/bonsai/bim/import_ifc.py b/src/bonsai/bonsai/bim/import_ifc.py
index 5c36163207..903f0ca6a3 100644
--- a/src/bonsai/bonsai/bim/import_ifc.py
+++ b/src/bonsai/bonsai/bim/import_ifc.py
@@ -1092,7 +1092,10 @@ class IfcImporter:
                 verts=verts,
                 load_indexed_maps=self.ifc_import_settings.load_indexed_maps,
             )
-            return tool.Loader.slice_layerset_mesh(element, mesh)
+            # E.g. `create_mesh` is also used for IfcRelSpaceBoundary.
+            if element.is_a("IfcObjectDefinition"):
+                return tool.Loader.slice_layerset_mesh(element, mesh)
+            return mesh
         except:
             self.ifc_import_settings.logger.error("Could not create mesh for %s", element)
             import traceback
diff --git a/src/bonsai/bonsai/bim/module/boundary/operator.py b/src/bonsai/bonsai/bim/module/boundary/operator.py
index 820112bf9c..14d9987d8a 100644
--- a/src/bonsai/bonsai/bim/module/boundary/operator.py
+++ b/src/bonsai/bonsai/bim/module/boundary/operator.py
@@ -72,13 +72,16 @@ class Loader:
         # ConnectionGeometry is optional in IFC schema for some reasons.
         if not boundary.ConnectionGeometry:
             return None
+        assert self.ifc_importer
+        assert self.operator
         surface = boundary.ConnectionGeometry.SurfaceOnRelatingElement
         # Workaround for invalid geometry provided by Revit. See https://github.com/Autodesk/revit-ifc/issues/270
         if surface.is_a("IfcCurveBoundedPlane") and not getattr(surface, "InnerBoundaries", None):
             surface.InnerBoundaries = ()
         try:
             shape = ifcopenshell.geom.create_shape(self.settings, surface)
-            mesh = self.ifc_importer.create_mesh(None, shape)
+            mesh = self.ifc_importer.create_mesh(boundary, shape)
+            assert mesh
             tool.Loader.link_mesh(shape, mesh)
         except RuntimeError:
             # Fallback solution for invalid geometry provided by Revit. (InnerBoundaries cuting OuterBoundary)