It very easy to see whats wrong, error point you direclly where is the issue. “Accessed None” means you trying to use or call somethign that does not exist or is not set yet, in your case it is “Armchair” varable, you do calls using that varable before that varable is set, or object that is that set to it is destroyed and you still doing calls on it. You either redesign youe blueprint in the way that it guarranty “Armchair” is always set, or you do check if “Armchair” is not None (IsValid node) before doing any actions on it