Program: 33913
Project: 33913
Buggy source:
/** 
 * Saves the player info to the file system
 */
public void save(){
  playerInfo.set("String_Node_Str",playerName);
  playerInfo.set("String_Node_Str",hasIsland);
  if (hasIsland && !banList.isEmpty()) {
    List<String> banListString=new ArrayList<String>();
    for (    UUID bannedUUID : banList) {
      banListString.add(bannedUUID.toString());
    }
    playerInfo.set("String_Node_Str",banListString);
  }
 else {
    playerInfo.set("String_Node_Str",null);
  }
  playerInfo.set("String_Node_Str",islandLocation);
  playerInfo.set("String_Node_Str",null);
  playerInfo.set("String_Node_Str",null);
  for (  int num : homeLocations.keySet()) {
    playerInfo.set("String_Node_Str" + num,Util.getStringLocation(homeLocations.get(num)));
  }
  playerInfo.set("String_Node_Str",inTeam);
  if (teamLeader == null) {
    playerInfo.set("String_Node_Str","String_Node_Str");
  }
 else {
    playerInfo.set("String_Node_Str",teamLeader.toString());
  }
  playerInfo.set("String_Node_Str",teamIslandLocation);
  playerInfo.set("String_Node_Str",islandLevel);
  List<String> temp=new ArrayList<String>();
  for (  UUID m : members) {
    temp.add(m.toString());
  }
  playerInfo.set("String_Node_Str",temp);
  playerInfo.set("String_Node_Str",null);
  for (  String challenge : challengeList.keySet()) {
    playerInfo.set("String_Node_Str" + challenge.replace("String_Node_Str","String_Node_Str"),challengeList.get(challenge));
  }
  for (  String challenge : challengeListTimes.keySet()) {
    playerInfo.set("String_Node_Str" + challenge.replace("String_Node_Str","String_Node_Str"),challengeListTimes.get(challenge));
  }
  if (Settings.resetLimit < this.resetsLeft) {
    this.resetsLeft=Settings.resetLimit;
  }
  playerInfo.set("String_Node_Str",this.resetsLeft);
  playerInfo.set("String_Node_Str",deaths);
  playerInfo.set("String_Node_Str",null);
  for (  Entry<Location,Date> en : kickedList.entrySet()) {
    Calendar coolDownTime=Calendar.getInstance();
    coolDownTime.setTime(en.getValue());
    playerInfo.set("String_Node_Str" + coolDownTime.getTimeInMillis(),Util.getStringLocation(en.getKey()));
  }
  playerInfo.set("String_Node_Str",locale);
  if (startIslandRating < 1) {
    playerInfo.set("String_Node_Str",null);
  }
 else {
    playerInfo.set("String_Node_Str",startIslandRating);
  }
  playerInfo.set("String_Node_Str",null);
  if (hasIsland) {
    if (plugin.getGrid() != null) {
      Island island=plugin.getGrid().getIsland(uuid);
      if (island != null) {
        playerInfo.set("String_Node_Str",island.save());
      }
    }
  }
  playerInfo.set("String_Node_Str",useControlPanel);
  Util.saveYamlFile(playerInfo,"String_Node_Str" + uuid.toString() + "String_Node_Str");
}

Fixed version (ground truth):
/** 
 * Saves the player info to the file system
 */
public void save(){
  playerInfo.set("String_Node_Str",playerName);
  playerInfo.set("String_Node_Str",hasIsland);
  if (hasIsland && !banList.isEmpty()) {
    List<String> banListString=new ArrayList<String>();
    for (    UUID bannedUUID : banList) {
      banListString.add(bannedUUID.toString());
    }
    playerInfo.set("String_Node_Str",banListString);
  }
 else {
    playerInfo.set("String_Node_Str",null);
  }
  playerInfo.set("String_Node_Str",islandLocation);
  playerInfo.set("String_Node_Str",null);
  playerInfo.set("String_Node_Str",null);
  for (  int num : homeLocations.keySet()) {
    playerInfo.set("String_Node_Str" + num,Util.getStringLocation(homeLocations.get(num)));
  }
  playerInfo.set("String_Node_Str",inTeam);
  if (teamLeader == null) {
    playerInfo.set("String_Node_Str","String_Node_Str");
  }
 else {
    playerInfo.set("String_Node_Str",teamLeader.toString());
  }
  playerInfo.set("String_Node_Str",teamIslandLocation);
  playerInfo.set("String_Node_Str",islandLevel);
  List<String> temp=new ArrayList<String>();
  for (  UUID m : members) {
    temp.add(m.toString());
  }
  playerInfo.set("String_Node_Str",temp);
  playerInfo.set("String_Node_Str",null);
  for (  String challenge : challengeList.keySet()) {
    if (!challenge.isEmpty())     playerInfo.set("String_Node_Str" + challenge.replace("String_Node_Str","String_Node_Str"),challengeList.get(challenge));
  }
  for (  String challenge : challengeListTimes.keySet()) {
    if (!challenge.isEmpty())     playerInfo.set("String_Node_Str" + challenge.replace("String_Node_Str","String_Node_Str"),challengeListTimes.get(challenge));
  }
  if (Settings.resetLimit < this.resetsLeft) {
    this.resetsLeft=Settings.resetLimit;
  }
  playerInfo.set("String_Node_Str",this.resetsLeft);
  playerInfo.set("String_Node_Str",deaths);
  playerInfo.set("String_Node_Str",null);
  for (  Entry<Location,Date> en : kickedList.entrySet()) {
    Calendar coolDownTime=Calendar.getInstance();
    coolDownTime.setTime(en.getValue());
    playerInfo.set("String_Node_Str" + coolDownTime.getTimeInMillis(),Util.getStringLocation(en.getKey()));
  }
  playerInfo.set("String_Node_Str",locale);
  if (startIslandRating < 1) {
    playerInfo.set("String_Node_Str",null);
  }
 else {
    playerInfo.set("String_Node_Str",startIslandRating);
  }
  playerInfo.set("String_Node_Str",null);
  if (hasIsland) {
    if (plugin.getGrid() != null) {
      Island island=plugin.getGrid().getIsland(uuid);
      if (island != null) {
        playerInfo.set("String_Node_Str",island.save());
      }
    }
  }
  playerInfo.set("String_Node_Str",useControlPanel);
  Util.saveYamlFile(playerInfo,"String_Node_Str" + uuid.toString() + "String_Node_Str");
}