Program: 57986
Project: 57986
Buggy source:
public static boolean onCommand(final PlotPlayer player,final String cmd,String... args){
  int help_index=-1;
  String category=null;
  if (args.length == 0) {
    help_index=0;
  }
 else   if (StringMan.isEqualIgnoreCaseToAny(args[0],"String_Node_Str","String_Node_Str","String_Node_Str")) {
    help_index=0;
switch (args.length) {
case 3:
{
        category=args[1];
        if (MathMan.isInteger(args[2])) {
          try {
            help_index=Integer.parseInt(args[2]);
          }
 catch (          NumberFormatException e) {
          }
        }
        break;
      }
case 2:
{
      if (MathMan.isInteger(args[1])) {
        category=null;
        try {
          help_index=Integer.parseInt(args[1]);
        }
 catch (        NumberFormatException e) {
        }
      }
      if (category == null) {
        category=args[1];
      }
      break;
    }
}
}
 else if (args.length == 1 && MathMan.isInteger(args[args.length - 1])) {
try {
  help_index=Integer.parseInt(args[args.length - 1]);
}
 catch (NumberFormatException e) {
}
}
 else if (ConsolePlayer.isConsole(player) && args.length >= 2) {
System.out.print(1);
String[] split=args[0].split("String_Node_Str");
String world;
PlotId id;
if (split.length == 2) {
  world=player.getLocation().getWorld();
  id=PlotId.fromString(split[0] + "String_Node_Str" + split[1]);
}
 else if (split.length == 3) {
  world=split[0];
  id=PlotId.fromString(split[1] + "String_Node_Str" + split[2]);
}
 else {
  id=null;
  world=null;
}
if (id != null && PS.get().isPlotWorld(world)) {
  System.out.print(2 + "String_Node_Str" + id+ "String_Node_Str"+ world);
  Plot plot=MainUtil.getPlot(world,id);
  if (plot != null) {
    System.out.print(3 + "String_Node_Str" + plot);
    player.teleport(MainUtil.getPlotCenter(plot));
    args=Arrays.copyOfRange(args,1,args.length);
  }
}
}
if (help_index != -1) {
displayHelp(player,category,help_index,cmd);
return true;
}
StringBuilder builder=new StringBuilder(cmd).append("String_Node_Str");
Iterator<String> iterator=Arrays.asList(args).iterator();
while (iterator.hasNext()) {
builder.append(iterator.next());
if (iterator.hasNext()) {
  builder.append("String_Node_Str");
}
}
getInstance().handle(player,builder.toString());
return true;
}

Fixed version (ground truth):
public static boolean onCommand(final PlotPlayer player,final String cmd,String... args){
  int help_index=-1;
  String category=null;
  if (args.length == 0) {
    help_index=0;
  }
 else   if (StringMan.isEqualIgnoreCaseToAny(args[0],"String_Node_Str","String_Node_Str","String_Node_Str")) {
    help_index=0;
switch (args.length) {
case 3:
{
        category=args[1];
        if (MathMan.isInteger(args[2])) {
          try {
            help_index=Integer.parseInt(args[2]);
          }
 catch (          NumberFormatException e) {
          }
        }
        break;
      }
case 2:
{
      if (MathMan.isInteger(args[1])) {
        category=null;
        try {
          help_index=Integer.parseInt(args[1]);
        }
 catch (        NumberFormatException e) {
        }
      }
      if (category == null) {
        category=args[1];
      }
      break;
    }
}
}
 else if (args.length == 1 && MathMan.isInteger(args[args.length - 1])) {
try {
  help_index=Integer.parseInt(args[args.length - 1]);
}
 catch (NumberFormatException e) {
}
}
 else if (ConsolePlayer.isConsole(player) && args.length >= 2) {
String[] split=args[0].split("String_Node_Str");
String world;
PlotId id;
if (split.length == 2) {
  world=player.getLocation().getWorld();
  id=PlotId.fromString(split[0] + "String_Node_Str" + split[1]);
}
 else if (split.length == 3) {
  world=split[0];
  id=PlotId.fromString(split[1] + "String_Node_Str" + split[2]);
}
 else {
  id=null;
  world=null;
}
if (id != null && PS.get().isPlotWorld(world)) {
  Plot plot=MainUtil.getPlot(world,id);
  if (plot != null) {
    player.teleport(MainUtil.getPlotCenter(plot));
    args=Arrays.copyOfRange(args,1,args.length);
  }
}
}
if (help_index != -1) {
displayHelp(player,category,help_index,cmd);
return true;
}
StringBuilder builder=new StringBuilder(cmd).append("String_Node_Str");
Iterator<String> iterator=Arrays.asList(args).iterator();
while (iterator.hasNext()) {
builder.append(iterator.next());
if (iterator.hasNext()) {
  builder.append("String_Node_Str");
}
}
getInstance().handle(player,builder.toString());
return true;
}