xSell Total Re-do

public class xSellBooster extends Booster {

    private static HashMap<UUID, Integer> sells = new HashMap<UUID, Integer>();
    private static List<String> players = new ArrayList<String>();

    public xSellBooster(Player p, double multiplier, boolean silent, int totalSells) {
        super(multiplier, silent, true);

        players.add(p.getName());
        sells.put(p.getUniqueId(), sells.get(p.getUniqueId()) + totalSells);

    }

    @Override
    public String getOwner() {
        return "Your";
    }

    @Override
    public long formatTime() {
      return -1;
    }

    @Override
    public List<String> getAppliedPlayers() {
        return players;
    }

    static {

        SellEvent se = new SellEvent() {
            @Override
            public void onSell(Player p, Type type, int itemsSold, double money) {
                sells.put(p.getUniqueId(), sells.get(p.getUniqueId()) - 1);

                if (sells.get(p) == 0 && sells.get(p) != null) {
                    players.remove(p);
                    sells.remove(p);
                }
            }
        };

    QuickSell.registerSellEvent(se);

    }
}