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I'm making a Blender script to decimate each selected object from an IFC file. But in some IFC files appears the following error: TypeError: ‘NoneType’ object is not subscriptable

`import bpy

def is_valid_mesh(obj):

if obj.type == 'MESH' and obj.data and len(obj.data.vertices) > 0 and len(obj.data.polygons) > 0:

    return True

return False

for obj in bpy.context.selected_objects:

if is_valid_mesh(obj):

    try:

        decimate_modifier = obj.modifiers.new(name="Decimate", type='DECIMATE')

        decimate_modifier.ratio = 0.1

        bpy.context.view_layer.objects.active = obj

        bpy.ops.object.modifier_apply(modifier=decimate_modifier.name)

        print(f"Decimate modifier applied to {obj.name}")

    except RuntimeError as e:

        print(f"Failed to apply Decimate modifier on {obj.name}: {e}")

else:

    print(f"Skipping {obj.name} (invalid geometry)")

try:

bpy.ops.bim.update_representation()

print("Update Representation executed successfully.")

except RuntimeError as e:

print(f"Failed to execute 'Update Representation': {e}")

output_path = "route/to/output/path"

try:

bpy.ops.bim.save_project(filepath=output_path)

print(f"IFC file exported successfully to {output_path}")

except RuntimeError as e:

print(f"Failed to export IFC file: {e}")`