Program: 86620
Project: 86620
Buggy source:
private void player(Player player,String[] args){
  Player target=Canary.getServer().matchPlayer(args[1]);
  if (args.length == 2) {
    if (target != null) {
      player.teleportTo(target.getLocation(),TeleportHook.TeleportCause.COMMAND);
      player.message(Colors.YELLOW + Translator.translateAndFormat("String_Node_Str",target.getName()));
    }
 else {
      World w=Canary.getServer().getWorldManager().getWorld(args[1],player.hasPermission("String_Node_Str"));
      if (w == null) {
        player.notice(Translator.translateAndFormat("String_Node_Str",args[1]));
      }
      if (player.hasPermission("String_Node_Str")) {
        player.teleportTo(w.getSpawnLocation());
      }
    }
  }
 else   if (args.length > 3) {
    try {
      double x=Double.parseDouble(args[1]), y=Double.parseDouble(args[2]), z=Double.parseDouble(args[3]);
      if (args.length > 4 && player.hasPermission("String_Node_Str")) {
        try {
          String dTypeName=args[4].replaceAll("String_Node_Str","String_Node_Str");
          DimensionType dType=DimensionType.fromName(dTypeName);
          String correctedName=dType == null ? args[4] : args[4].replaceAll("String_Node_Str","String_Node_Str");
          if (dType == null) {
            dType=DimensionType.fromName("String_Node_Str");
          }
          World world=Canary.getServer().getWorldManager().getWorld(correctedName,dType,args.length > 5 && player.hasPermission("String_Node_Str") ? Boolean.valueOf(args[5]) : false);
          if (world != null) {
            player.teleportTo(x,y,z,world);
          }
 else {
            player.notice("String_Node_Str");
          }
        }
 catch (        UnknownWorldException uwex) {
          player.notice("String_Node_Str");
        }
      }
 else {
        player.teleportTo(x,y,z);
      }
    }
 catch (    NumberFormatException nfex) {
      player.notice(Translator.translateAndFormat("String_Node_Str"));
    }
  }
 else   if (target != null) {
    player.teleportTo(target.getLocation(),TeleportHook.TeleportCause.COMMAND);
    player.message(Colors.YELLOW + Translator.translateAndFormat("String_Node_Str",target.getName()));
  }
 else {
    player.notice(Translator.translateAndFormat("String_Node_Str",args[1]));
  }
}

Fixed version (ground truth):
private void player(Player player,String[] args){
  Player target=Canary.getServer().matchPlayer(args[1]);
  if (args.length == 2) {
    if (target != null) {
      player.teleportTo(target.getLocation(),TeleportHook.TeleportCause.COMMAND);
      player.message(Colors.YELLOW + Translator.translateAndFormat("String_Node_Str",target.getName()));
    }
 else {
      World w=Canary.getServer().getWorldManager().getWorld(args[1],player.hasPermission("String_Node_Str"));
      if (w == null) {
        player.notice(Translator.translateAndFormat("String_Node_Str",args[1]));
        return;
      }
      if (player.hasPermission("String_Node_Str")) {
        player.teleportTo(w.getSpawnLocation());
      }
    }
  }
 else   if (args.length > 3) {
    try {
      double x=Double.parseDouble(args[1]), y=Double.parseDouble(args[2]), z=Double.parseDouble(args[3]);
      if (args.length > 4 && player.hasPermission("String_Node_Str")) {
        try {
          String dTypeName=args[4].replaceAll("String_Node_Str","String_Node_Str");
          DimensionType dType=DimensionType.fromName(dTypeName);
          String correctedName=dType == null ? args[4] : args[4].replaceAll("String_Node_Str","String_Node_Str");
          if (dType == null) {
            dType=DimensionType.fromName("String_Node_Str");
          }
          World world=Canary.getServer().getWorldManager().getWorld(correctedName,dType,args.length > 5 && player.hasPermission("String_Node_Str") ? Boolean.valueOf(args[5]) : false);
          if (world != null) {
            player.teleportTo(x,y,z,world);
          }
 else {
            player.notice("String_Node_Str");
          }
        }
 catch (        UnknownWorldException uwex) {
          player.notice("String_Node_Str");
        }
      }
 else {
        player.teleportTo(x,y,z);
      }
    }
 catch (    NumberFormatException nfex) {
      player.notice(Translator.translateAndFormat("String_Node_Str"));
    }
  }
 else   if (target != null) {
    player.teleportTo(target.getLocation(),TeleportHook.TeleportCause.COMMAND);
    player.message(Colors.YELLOW + Translator.translateAndFormat("String_Node_Str",target.getName()));
  }
 else {
    player.notice(Translator.translateAndFormat("String_Node_Str",args[1]));
  }
}