General suggestion
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In Blender, when the undo/redo operation system (ctrl+z / ctrl+shift+z) is performed, all objects in the scene are fully recreated. Pointers to the old objects will fail. Therefore, please store list of object names instead of object itself, and then use them by ``bpy.data.objects[name]``. This is same for collection and others.

IDE
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``VS Code`` with ``Blender Development`` extenstion is highly recommended to used . Please read : https://marketplace.visualstudio.com/items?itemName=JacquesLucke.blender-development