BauSystem_Main/src/de/steamwar/bausystem/features/attributescopy/AttributesPlaceListener.java

@@ -33,7 +33,6 @@ import org.bukkit.event.Listener;
 import org.bukkit.event.block.BlockPlaceEvent;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
-import org.bukkit.profile.PlayerProfile;
 
 import java.util.HashSet;
 import java.util.List;

BauSystem_Main/src/de/steamwar/bausystem/features/warp/WarpListener.java

@@ -141,7 +141,10 @@ public class WarpListener implements Listener {
 
     @EventHandler
     public void onPlayerQuit(PlayerQuitEvent event) {
-        warpEntityServer.remove(event.getPlayer()).close();
+        warpEntityServer.computeIfPresent(event.getPlayer(), (player, rEntityServer) -> {
+            rEntityServer.close();
+            return null;
+        });
         selected.remove(event.getPlayer());
     }
 }