Hotfix weird tablist behaviour

src/de/steamwar/bungeecore/tablist/TablistServer.java

@@ -93,7 +93,8 @@ public class TablistServer implements TablistPart {
         return players.stream().map(item -> {
             ProxiedPlayer p = BungeeCord.getInstance().getPlayer(item.getUuid());
             if (p == null) return item;
-            if (Subserver.getSubserver(p.getServer().getInfo()).getType() == Servertype.ARENA) return item;
+            Subserver subserver = Subserver.getSubserver(p.getServer().getInfo());
+            if (subserver != null && subserver.getType() == Servertype.ARENA) return item;
             if (SteamwarUser.get(p.getUniqueId()).getTeam() != team) return item;
             return new Item(p, true);
         });