Potential Fix

src/de/steamwar/lobby/LobbyPacketHandler.java

@@ -21,17 +21,22 @@ package de.steamwar.lobby;
 
 import de.steamwar.network.packets.PacketHandler;
 import de.steamwar.network.packets.common.FightInfoPacket;
+import de.steamwar.network.packets.server.StartingServerPacket;
+import de.steamwar.sql.SteamwarUser;
+import org.bukkit.Bukkit;
+import org.bukkit.event.player.PlayerTeleportEvent;
+
+import java.util.Objects;
 
 public class LobbyPacketHandler extends PacketHandler {
 
-    public LobbyPacketHandler() {
-        super();
-        this.register();
-    }
-
     @Handler
     public void handleFightserver(FightInfoPacket packet) {
         Fightserver.newFightInfo(packet);
     }
 
+    @Handler
+    private void serverStarting(StartingServerPacket in) {
+        Objects.requireNonNull(Bukkit.getPlayer(SteamwarUser.get(in.getUser()).getUUID())).teleport(LobbySystem.config().getWaitingHallSpawn(), PlayerTeleportEvent.TeleportCause.PLUGIN);
+    }
 }

src/de/steamwar/lobby/LobbySystem.java

@@ -45,7 +45,6 @@ public class LobbySystem extends JavaPlugin {
         message = new Message("de.steamwar.lobby.LobbySystem", getClassLoader());
 
         Fightserver.init();
-        new WaitingHall();
         new Portals();
         new PortalCommand();
         new HologramCommand();
@@ -68,7 +67,7 @@ public class LobbySystem extends JavaPlugin {
         new AlphaWall(l -> l.getX() < 2977, AlphaWall.REFLECT_X);
         new AlphaWall(l -> l.getZ() > 892, AlphaWall.REFLECT_Z);
         new AlphaWall(l -> l.getZ() < 1794, AlphaWall.REFLECT_Z);
-        new LobbyPacketHandler();
+        new LobbyPacketHandler().register();
     }
 
     @Override

src/de/steamwar/lobby/WaitingHall.java

@@ -1,38 +0,0 @@
-/*
- * This file is a part of the SteamWar software.
- *
- * Copyright (C) 2022  SteamWar.de-Serverteam
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package de.steamwar.lobby;
-
-import de.steamwar.network.packets.PacketHandler;
-import de.steamwar.sql.SteamwarUser;
-import de.steamwar.network.packets.server.StartingServerPacket;
-import org.bukkit.Bukkit;
-import org.bukkit.event.player.PlayerTeleportEvent;
-
-public class WaitingHall extends PacketHandler {
-    public WaitingHall() {
-        super();
-        this.register();
-    }
-
-    @Handler
-    private void serverStarting(StartingServerPacket in) {
-        Bukkit.getPlayer(SteamwarUser.get(in.getUser()).getUUID()).teleport(LobbySystem.config().getWaitingHallSpawn(), PlayerTeleportEvent.TeleportCause.PLUGIN);
-    }
-}