See Security-Breach issue

src/de/steamwar/bungeecore/commands/BauCommand.java

@@ -24,6 +24,7 @@ import de.steamwar.bungeecore.inventory.SWInventory;
 import de.steamwar.bungeecore.inventory.SWItem;
 import de.steamwar.bungeecore.sql.BauweltMember;
 import de.steamwar.bungeecore.sql.SteamwarUser;
+import java.util.Collection;
 import net.md_5.bungee.api.ProxyServer;
 import net.md_5.bungee.api.connection.ProxiedPlayer;
 import net.md_5.bungee.api.event.ChatEvent;
@@ -220,10 +221,11 @@ public class BauCommand {
         ProxiedPlayer z = ProxyServer.getInstance().getPlayer(SteamwarUser.get(target.getMemberID()).getUuid());
         if(z != null){
             Message.send("BAU_DELMEMBER_DELETED_TARGET", z, p.getName());
-            Subserver server = Subserver.getSubserver(z);
-            if(server != null && server.getType() == Servertype.BAUSERVER && ((Bauserver)server).getOwner().equals(p.getUniqueId()))
+            Collection<Subserver> servers = Subserver.getAllServers(z);
+            if (!servers.isEmpty() && servers.stream().filter(server -> server.getType() == Servertype.BAUSERVER).anyMatch(server -> ((Bauserver) server).getOwner().equals(p.getUniqueId()))) {
                 z.connect(ProxyServer.getInstance().getServerInfo(BungeeCore.LOBBY_SERVER));
             }
+        }
         Message.send("BAU_DELMEMBER_DELETED", p);
     }