fix nullpo対策 原因は当たり判定のせいかな

Author: Elic0de

src/main/java/com/github/elic0de/thejpspit/TheJpsPit.java

@@ -219,6 +219,7 @@ public void onDisable() {
 
         Bukkit.getOnlinePlayers().forEach(player -> {
             final PitPlayer pitPlayer = PitPlayerManager.getPitPlayer(player);
+            if (pitPlayer == null) return;
             game.leave(pitPlayer);
             pitPlayer.getBoard().destoryScoreboard();
         });