BlenderBIM - Bug by clicking on "Unlinking object" in "IFC Class"

[vuicBABS]

After importing an element (IfcWall, ...) from another file, under IFC Class I press "Unlinking Object" and get this error message:

Python: Traceback (most recent call last):
File "C:\xxx\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\blenderbim\bim\module\pset\ui.py", line 148, in poll
Data.load(IfcStore.get_file(), props.ifc_definition_id)
File "C:\xxx\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\blenderbim\libs\site\packages\ifcopenshell\api\pset\data.py", line 23, in load
product = file.by_id(product_id)
File "C:\xxx\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\blenderbim\libs\site\packages\ifcopenshell\file.py", line 111, in by_id
return self[id]
File "C:\xxx\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\blenderbim\libs\site\packages\ifcopenshell\file.py", line 99, in getitem
return entity_instance(self.wrapped_data.by_id(key))
File "C:\xxx\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\blenderbim\libs\site\packages\ifcopenshell\ifcopenshell_wrapper.py", line 1498, in by_id
return _ifcopenshell_wrapper.file_by_id(self, id)
RuntimeError: Instance #80 not found

location: :-1

The problem occurs after importing object from a .blend file with the append method.