Program: 10546
Project: 10546
Buggy source:
@EventHandler public void PlayerProximityListener(PlayerMoveEvent event){
  if (!event.getTo().getBlock().equals(event.getFrom().getBlock())) {
    plugin=(Denizen)Bukkit.getPluginManager().getPlugin("String_Node_Str");
    if (!Denizen.validLocations.isEmpty()) {
      for (      Location theLocation : Denizen.validLocations.keySet()) {
        if (Denizen.scriptEngine.checkLocation(event.getPlayer(),theLocation,3) && Denizen.getDenizen.checkLocationCooldown(event.getPlayer())) {
          String theScript=Denizen.getScript.getInteractScript(CitizensAPI.getNPCRegistry().getNPC(Integer.valueOf(Denizen.validLocations.get(theLocation).split("String_Node_Str")[0])),event.getPlayer());
          if (!theScript.equals("String_Node_Str")) {
            Denizen.scriptEngine.parseScript(CitizensAPI.getNPCRegistry().getNPC(Integer.valueOf(Denizen.validLocations.get(theLocation).split("String_Node_Str")[0])),event.getPlayer(),Denizen.getScript.getNameFromEntry(theScript),Denizen.validLocations.get(theLocation).split("String_Node_Str")[1],ScriptEngine.Trigger.LOCATION);
            Denizen.locationCooldown.put(event.getPlayer(),System.currentTimeMillis() + 30000);
            break;
          }
        }
      }
    }
    if (plugin.getSaves().contains("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str")) {
      List<String> listAll=plugin.getSaves().getStringList("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str");
      if (!listAll.isEmpty()) {
        for (        String theTask : listAll) {
          String[] taskArgs=theTask.split("String_Node_Str");
          Location theLocation=Denizen.getDenizen.getBookmark(taskArgs[1],taskArgs[0],"String_Node_Str");
          int theLeeway=plugin.getSaves().getInt("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str"+ taskArgs[2]+ "String_Node_Str");
          long theDuration=plugin.getSaves().getLong("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str"+ taskArgs[2]+ "String_Node_Str");
          if (Denizen.scriptEngine.checkLocation(event.getPlayer(),theLocation,theLeeway)) {
            if (plugin.getSaves().contains("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str"+ taskArgs[2]+ "String_Node_Str")) {
              if (plugin.getSaves().getLong("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str"+ taskArgs[2]+ "String_Node_Str") + (theDuration * 1000) <= System.currentTimeMillis())               Denizen.scriptEngine.finishLocationTask(event.getPlayer(),taskArgs[2]);
            }
 else {
              plugin.getSaves().set("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str"+ taskArgs[2]+ "String_Node_Str",System.currentTimeMillis());
              plugin.saveSaves();
            }
          }
        }
      }
    }
  }
}

Fixed version (ground truth):
@EventHandler public void PlayerProximityListener(PlayerMoveEvent event){
  if (!event.getTo().getBlock().equals(event.getFrom().getBlock())) {
    plugin=(Denizen)Bukkit.getPluginManager().getPlugin("String_Node_Str");
    if (!Denizen.validLocations.isEmpty()) {
      for (      Location theLocation : Denizen.validLocations.keySet()) {
        if (Denizen.scriptEngine.checkLocation(event.getPlayer(),theLocation,1) && Denizen.getDenizen.checkLocationCooldown(event.getPlayer())) {
          String theScript=Denizen.getScript.getInteractScript(CitizensAPI.getNPCRegistry().getNPC(Integer.valueOf(Denizen.validLocations.get(theLocation).split("String_Node_Str")[0])),event.getPlayer());
          if (!theScript.equals("String_Node_Str")) {
            Denizen.scriptEngine.parseScript(CitizensAPI.getNPCRegistry().getNPC(Integer.valueOf(Denizen.validLocations.get(theLocation).split("String_Node_Str")[0])),event.getPlayer(),Denizen.getScript.getNameFromEntry(theScript),Denizen.validLocations.get(theLocation).split("String_Node_Str")[1],ScriptEngine.Trigger.LOCATION);
            Denizen.locationCooldown.put(event.getPlayer(),System.currentTimeMillis() + 30000);
            break;
          }
        }
      }
    }
    if (plugin.getSaves().contains("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str")) {
      List<String> listAll=plugin.getSaves().getStringList("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str");
      if (!listAll.isEmpty()) {
        for (        String theTask : listAll) {
          String[] taskArgs=theTask.split("String_Node_Str");
          Location theLocation=Denizen.getDenizen.getBookmark(taskArgs[1],taskArgs[0],"String_Node_Str");
          int theLeeway=plugin.getSaves().getInt("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str"+ taskArgs[2]+ "String_Node_Str");
          long theDuration=plugin.getSaves().getLong("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str"+ taskArgs[2]+ "String_Node_Str");
          if (Denizen.scriptEngine.checkLocation(event.getPlayer(),theLocation,theLeeway)) {
            if (plugin.getSaves().contains("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str"+ taskArgs[2]+ "String_Node_Str")) {
              if (plugin.getSaves().getLong("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str"+ taskArgs[2]+ "String_Node_Str") + (theDuration * 1000) <= System.currentTimeMillis())               Denizen.scriptEngine.finishLocationTask(event.getPlayer(),taskArgs[2]);
            }
 else {
              plugin.getSaves().set("String_Node_Str" + event.getPlayer().getName() + "String_Node_Str"+ taskArgs[2]+ "String_Node_Str",System.currentTimeMillis());
              plugin.saveSaves();
            }
          }
        }
      }
    }
  }
}