Program: 58066
Project: 58066
Buggy source:
@Override public boolean execute(final PlotPlayer plr,final String... args){
  if (args.length < 1) {
    noArgs(plr);
    return false;
  }
  int page=0;
  if (args.length > 1) {
    try {
      page=Integer.parseInt(args[1]);
      --page;
      if (page < 0) {
        page=0;
      }
    }
 catch (    final Exception e) {
      page=0;
    }
  }
  Collection<Plot> plots=null;
  String world;
  if (plr != null) {
    world=plr.getLocation().getWorld();
  }
 else {
    Set<String> worlds=PlotSquared.getPlotWorlds();
    if (worlds.size() == 0) {
      world="String_Node_Str";
    }
 else {
      world=worlds.iterator().next();
    }
  }
  String arg=args[0].toLowerCase();
switch (arg) {
case "String_Node_Str":
{
      if (plr == null) {
        break;
      }
      plots=PlotSquared.getPlots(plr);
    }
case "String_Node_Str":
{
    if (plr == null) {
      break;
    }
    for (    Plot plot : PlotSquared.getPlots()) {
      if (plot.helpers.contains(plr.getUUID()) || plot.trusted.contains(plr.getUUID())) {
        plots.add(plot);
      }
    }
  }
case "String_Node_Str":
{
  plots=PlotSquared.getPlots(world).values();
  break;
}
case "String_Node_Str":
{
plots=PlotSquared.getPlots();
break;
}
case "String_Node_Str":
{
if (PlotSquared.economy == null) {
break;
}
plots=new HashSet<>();
for (Plot plot : PlotSquared.getPlots()) {
final Flag price=FlagManager.getPlotFlag(plot,"String_Node_Str");
if (price != null) {
  plots.add(plot);
}
}
break;
}
case "String_Node_Str":
{
plots=new HashSet<>();
for (Plot plot : PlotSquared.getPlots()) {
if (plot.owner == null) {
plots.add(plot);
}
}
break;
}
case "String_Node_Str":
{
plots=new HashSet<>();
for (Plot plot : PlotSquared.getPlots()) {
if (plot.owner == null) {
continue;
}
if (UUIDHandler.getName(plot.owner) == null) {
plots.add(plot);
}
}
break;
}
default :
{
if (PlotSquared.isPlotWorld(args[0])) {
plots=PlotSquared.getPlots(args[0]).values();
break;
}
UUID uuid=UUIDHandler.getUUID(args[0]);
if (uuid != null) {
plots=PlotSquared.getPlots(uuid);
break;
}
}
}
if (plots == null) {
sendMessage(plr,C.DID_YOU_MEAN,new StringComparison(args[0],new String[]{"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"}).getBestMatch());
return false;
}
if (plots.size() == 0) {
MainUtil.sendMessage(plr,C.NO_PLOTS);
return false;
}
displayPlots(plr,plots,page);
return true;
}

Fixed version (ground truth):
@Override public boolean execute(final PlotPlayer plr,final String... args){
  if (args.length < 1) {
    noArgs(plr);
    return false;
  }
  int page=0;
  if (args.length > 1) {
    try {
      page=Integer.parseInt(args[1]);
      --page;
      if (page < 0) {
        page=0;
      }
    }
 catch (    final Exception e) {
      page=0;
    }
  }
  Collection<Plot> plots=null;
  String world;
  if (plr != null) {
    world=plr.getLocation().getWorld();
  }
 else {
    Set<String> worlds=PlotSquared.getPlotWorlds();
    if (worlds.size() == 0) {
      world="String_Node_Str";
    }
 else {
      world=worlds.iterator().next();
    }
  }
  String arg=args[0].toLowerCase();
switch (arg) {
case "String_Node_Str":
{
      if (plr == null) {
        break;
      }
      plots=PlotSquared.getPlots(plr);
      break;
    }
case "String_Node_Str":
{
    if (plr == null) {
      break;
    }
    plots=new ArrayList<Plot>();
    for (    Plot plot : PlotSquared.getPlots()) {
      if (plot.helpers.contains(plr.getUUID()) || plot.trusted.contains(plr.getUUID())) {
        plots.add(plot);
      }
    }
    break;
  }
case "String_Node_Str":
{
  plots=PlotSquared.getPlots(world).values();
  break;
}
case "String_Node_Str":
{
plots=PlotSquared.getPlots();
break;
}
case "String_Node_Str":
{
if (PlotSquared.economy == null) {
break;
}
plots=new HashSet<>();
for (Plot plot : PlotSquared.getPlots()) {
final Flag price=FlagManager.getPlotFlag(plot,"String_Node_Str");
if (price != null) {
  plots.add(plot);
}
}
break;
}
case "String_Node_Str":
{
plots=new HashSet<>();
for (Plot plot : PlotSquared.getPlots()) {
if (plot.owner == null) {
plots.add(plot);
}
}
break;
}
case "String_Node_Str":
{
plots=new HashSet<>();
for (Plot plot : PlotSquared.getPlots()) {
if (plot.owner == null) {
continue;
}
if (UUIDHandler.getName(plot.owner) == null) {
plots.add(plot);
}
}
break;
}
default :
{
if (PlotSquared.isPlotWorld(args[0])) {
plots=PlotSquared.getPlots(args[0]).values();
break;
}
UUID uuid=UUIDHandler.getUUID(args[0]);
if (uuid != null) {
plots=PlotSquared.getPlots(uuid);
break;
}
}
}
if (plots == null) {
sendMessage(plr,C.DID_YOU_MEAN,new StringComparison(args[0],new String[]{"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"}).getBestMatch());
return false;
}
if (plots.size() == 0) {
MainUtil.sendMessage(plr,C.FOUND_NO_PLOTS);
return false;
}
displayPlots(plr,plots,page);
return true;
}