@Override
    protected Serializable processMethod() throws AsyncException {
      version++;
      if (fdata != null) {
        Graph data = fdata.getGraph();
        if (data != null) {
          data.delete(getHandler(""), t);
        }
      }
      if (isPrepared) {
        fdeductions.getGraph().delete(getHandler(""), t);
      }

      return null;
    }