diff --git a/src/blenderbim/blenderbim/bim/module/geometry/operator.py b/src/blenderbim/blenderbim/bim/module/geometry/operator.py
index 70274f7b72..4ad66ebda0 100644
--- a/src/blenderbim/blenderbim/bim/module/geometry/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/geometry/operator.py
@@ -92,13 +92,14 @@ class AddRepresentation(bpy.types.Operator):
         gprop = context.scene.BIMGeoreferenceProperties
         objs = [bpy.data.objects.get(self.obj)] if self.obj else context.selected_objects
         for obj in objs:
-            if not obj.BIMObjectProperties.ifc_definition_id:
+            obj_id = obj.BIMObjectProperties.ifc_definition_id
+            if not obj_id:
                 continue
             bpy.ops.bim.edit_object_placement(obj=obj.name)
             if not obj.data or not hasattr(obj.data, "polygons"):
                 continue
 
-            product = self.file.by_id(obj.BIMObjectProperties.ifc_definition_id)
+            product = self.file.by_id(obj_id)
 
             context_id = self.context_id or int(context.scene.BIMProperties.contexts)
             context_of_items = self.file.by_id(context_id)
@@ -158,7 +159,7 @@ class AddRepresentation(bpy.types.Operator):
             mesh.name = "{}/{}".format(context_id, result.id())
             mesh.BIMMeshProperties.ifc_definition_id = int(result.id())
             obj.data = mesh
-            Data.load(IfcStore.get_file(), obj.BIMObjectProperties.ifc_definition_id)
+            Data.load(self.file, obj_id)
 
             if product.is_a("IfcTypeProduct"):
                 if self.file.schema == "IFC2X3":
@@ -167,7 +168,7 @@ class AddRepresentation(bpy.types.Operator):
                     types = product.Types
                 if types:
                     for element in types[0].RelatedObjects:
-                        Data.load(IfcStore.get_file(), element.id())
+                        Data.load(self.file, element.id())
         return {"FINISHED"}
 
 
diff --git a/src/blenderbim/blenderbim/bim/module/material/operator.py b/src/blenderbim/blenderbim/bim/module/material/operator.py
index 6b739e52d7..7637d98138 100644
--- a/src/blenderbim/blenderbim/bim/module/material/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/material/operator.py
@@ -125,23 +125,25 @@ class AssignMaterial(bpy.types.Operator):
 
     def _execute(self, context):
         self.file = IfcStore.get_file()
+        active_object = bpy.data.objects.get(self.obj, context.active_object)
         objs = [bpy.data.objects.get(self.obj)] if self.obj else context.selected_objects
-        for obj in objs:            
-            if not obj.BIMObjectProperties.ifc_definition_id:
+        material = self.file.by_id(int(active_object.BIMObjectMaterialProperties.material))
+        material_type = self.material_type or active_object.BIMObjectMaterialProperties.material_type
+        for obj in objs:
+            obj_id = obj.BIMObjectProperties.ifc_definition_id
+            if not obj_id:
                 continue
-            material_type = self.material_type or obj.BIMObjectMaterialProperties.material_type
-            element = self.file.by_id(obj.BIMObjectProperties.ifc_definition_id)
             ifcopenshell.api.run(
                 "material.assign_material",
                 self.file,
                 **{
-                    "product": element,
+                    "product": self.file.by_id(obj_id),
                     "type": material_type,
-                    "material": self.file.by_id(int(obj.BIMObjectMaterialProperties.material)),
+                    "material": material,
                 },
             )
-            Data.load(IfcStore.get_file())
-            Data.load(IfcStore.get_file(), obj.BIMObjectProperties.ifc_definition_id)
+            Data.load(self.file)
+            Data.load(self.file, obj_id)
         return {"FINISHED"}
 
 
@@ -504,26 +506,25 @@ class EditAssignedMaterial(bpy.types.Operator):
         self.file = IfcStore.get_file()
         obj = bpy.data.objects.get(self.obj) if self.obj else context.active_object
         props = obj.BIMObjectMaterialProperties
-        product_data = Data.products[obj.BIMObjectProperties.ifc_definition_id]
+        obj_id = obj.BIMObjectProperties.ifc_definition_id
+        product_data = Data.products[obj_id]
 
         if product_data["type"] == "IfcMaterial":
             bpy.ops.bim.unassign_material(obj=obj.name)
             bpy.ops.bim.assign_material(obj=obj.name, material_type="IfcMaterial")
-            Data.load(IfcStore.get_file(), obj.BIMObjectProperties.ifc_definition_id)
+            Data.load(self.file, obj_id)
             bpy.ops.bim.disable_editing_assigned_material(obj=obj.name)
             return {"FINISHED"}
 
         material_set = self.file.by_id(self.material_set)
 
-        attributes = {}
-        for attribute in props.material_set_attributes:
-            attributes[attribute.name] = None if attribute.is_null else attribute.string_value
+        attributes = {attribute.name: attribute.get_value() for attribute in props.material_set_attributes}
         ifcopenshell.api.run(
             "material.edit_assigned_material",
             self.file,
             **{"element": material_set, "attributes": attributes},
         )
-        Data.load(IfcStore.get_file(), obj.BIMObjectProperties.ifc_definition_id)
+        Data.load(self.file, obj_id)
 
         if self.material_set_usage:
             material_set_usage = self.file.by_id(self.material_set_usage)
@@ -737,17 +738,18 @@ class CopyMaterial(bpy.types.Operator):
         for obj in context.selected_objects:
             if obj == context.active_object:
                 continue
-            if not obj.BIMObjectProperties.ifc_definition_id:
+            obj_id = obj.BIMObjectProperties.ifc_definition_id
+            if not obj_id:
                 continue
             ifcopenshell.api.run(
                 "material.copy_material",
                 self.file,
                 **{
                     "material": material,
-                    "element": self.file.by_id(obj.BIMObjectProperties.ifc_definition_id),
+                    "element": self.file.by_id(obj_id),
                 },
             )
-            Data.load(self.file, obj.BIMObjectProperties.ifc_definition_id)
+            Data.load(self.file, obj_id)
             self.set_default_material(obj, material)
         return {"FINISHED"}
 
diff --git a/src/blenderbim/blenderbim/bim/module/spatial/operator.py b/src/blenderbim/blenderbim/bim/module/spatial/operator.py
index b2c4ed1dc9..5c01b0c357 100644
--- a/src/blenderbim/blenderbim/bim/module/spatial/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/spatial/operator.py
@@ -137,15 +137,20 @@ class RemoveContainer(bpy.types.Operator):
 
     def _execute(self, context):
         active_object = context.active_object
-        for obj in [bpy.data.objects.get(self.obj)] if self.obj else context.selected_objects:
-            oprops = obj.BIMObjectProperties
-            if not oprops.ifc_definition_id:
+        self.file = IfcStore.get_file()
+        objs = [bpy.data.objects.get(self.obj)] if self.obj else context.selected_objects
+        for obj in objs:
+            obj_id = obj.BIMObjectProperties.ifc_definition_id
+            if not obj_id:
                 continue
-            self.file = IfcStore.get_file()
             ifcopenshell.api.run(
-                "spatial.remove_container", self.file, **{"product": self.file.by_id(oprops.ifc_definition_id)}
+                "spatial.remove_container", 
+                self.file, 
+                **{
+                    "product": self.file.by_id(obj_id)
+                }
             )
-            Data.load(IfcStore.get_file(), oprops.ifc_definition_id)
+            Data.load(self.file, obj_id)
 
             aggregate_collection = bpy.data.collections.get(obj.name)
             if aggregate_collection: