Program: 83638
Project: 83638
Buggy source:
/** 
 * Save this player configuration to disk.
 * @return true if this player configuration was saved successfullyor skipped; false on error.
 */
public boolean save(){
  Map<String,Warp> playerWarps=this.plugin.getPrivateWarps(this.playerName);
  Map<String,Object> configWarps=new HashMap<String,Object>();
  for (  Entry<String,Warp> entry : playerWarps.entrySet()) {
    configWarps.put(entry.getKey(),entry.getValue().getConfigurationMap());
  }
  this.warpConfig.setProperty(OpenWarp.WARPS_LIST_KEY,configWarps);
  if (this.plugin.getDefaultHome(this.playerName) != null) {
    Map<String,Object> homeWarpConfig=new Warp(this.plugin,TEMP_HOME_NAME,this.plugin.getDefaultHome(this.playerName),this.playerName).getConfigurationMap();
    if (homeWarpConfig != null) {
      this.generalConfig.setProperty(OpenWarp.HOME_KEY,homeWarpConfig);
    }
 else {
      OpenWarp.LOG.warning(OpenWarp.LOG_PREFIX + "String_Node_Str" + this.playerName+ "String_Node_Str");
      OpenWarp.LOG.warning(OpenWarp.LOG_PREFIX + "String_Node_Str" + this.playerName);
      return true;
    }
  }
  Map<String,Location> worldHomes=this.plugin.getWorldHomes(this.playerName);
  if (worldHomes != null) {
    for (    String worldName : worldHomes.keySet()) {
      Location worldHome=worldHomes.get(worldName);
      String yamlKey=OpenWarp.MULTIWORLD_HOMES_KEY + "String_Node_Str" + worldName;
      Map<String,Object> worldHomeWarpConfig=new Warp(this.plugin,TEMP_HOME_NAME,worldHome,this.playerName).getConfigurationMap();
      if (worldHomeWarpConfig != null) {
        this.generalConfig.setProperty(yamlKey,worldHomeWarpConfig);
      }
 else {
        OpenWarp.LOG.warning(OpenWarp.LOG_PREFIX + "String_Node_Str" + this.playerName+ "String_Node_Str");
        OpenWarp.LOG.warning(OpenWarp.LOG_PREFIX + "String_Node_Str" + this.playerName);
        return true;
      }
    }
  }
  if (this.plugin.getLocationTracker().getPreviousLocation(this.playerName) != null) {
    Map<String,Object> backWarpConfig=new Warp(this.plugin,TEMP_BACK_NAME,this.plugin.getLocationTracker().getPreviousLocation(this.playerName),this.playerName).getConfigurationMap();
    if (backWarpConfig != null) {
      this.generalConfig.setProperty(OpenWarp.BACK_KEY,backWarpConfig);
    }
  }
  if (this.plugin.getLocationTracker().getLocationStack(this.playerName) != null) {
    Stack<Location> locationStack=this.plugin.getLocationTracker().getLocationStack(this.playerName);
    List<Map<String,Object>> locationStackConfig=new ArrayList<Map<String,Object>>();
    for (    Location location : locationStack) {
      locationStackConfig.add(new Warp(this.plugin,TEMP_STACK_NAME,location,this.playerName).getConfigurationMap());
    }
    if (locationStackConfig.size() > 0) {
      this.generalConfig.setProperty(OpenWarp.STACK_KEY,locationStackConfig);
    }
 else {
      this.generalConfig.setProperty(OpenWarp.STACK_KEY,null);
    }
  }
  this.quotaConfig.setProperty(OpenWarp.QUOTAS_KEY,this.plugin.getQuotaManager().getPlayerQuotaMap(this.playerName));
  return this.generalConfig.save() && this.warpConfig.save() && this.quotaConfig.save();
}

Fixed version (ground truth):
/** 
 * Save this player configuration to disk.
 * @return true if this player configuration was saved successfullyor skipped; false on error.
 */
public boolean save(){
  Map<String,Warp> playerWarps=this.plugin.getPrivateWarps(this.playerName);
  Map<String,Object> configWarps=new HashMap<String,Object>();
  for (  Entry<String,Warp> entry : playerWarps.entrySet()) {
    configWarps.put(entry.getKey(),entry.getValue().getConfigurationMap());
  }
  this.warpConfig.setProperty(OpenWarp.WARPS_LIST_KEY,configWarps);
  if (this.plugin.getDefaultHome(this.playerName) != null) {
    Map<String,Object> homeWarpConfig=new Warp(this.plugin,TEMP_HOME_NAME,this.plugin.getDefaultHome(this.playerName),this.playerName).getConfigurationMap();
    if (homeWarpConfig != null) {
      this.generalConfig.setProperty(OpenWarp.HOME_KEY,homeWarpConfig);
    }
 else {
      OpenWarp.LOG.warning(OpenWarp.LOG_PREFIX + "String_Node_Str" + this.playerName+ "String_Node_Str");
      OpenWarp.LOG.warning(OpenWarp.LOG_PREFIX + "String_Node_Str" + this.playerName);
      return true;
    }
  }
  Map<String,Location> worldHomes=this.plugin.getWorldHomes(this.playerName);
  if (worldHomes != null) {
    for (    String worldName : worldHomes.keySet()) {
      if (worldName != null) {
        Location worldHome=worldHomes.get(worldName);
        String yamlKey=OpenWarp.MULTIWORLD_HOMES_KEY + "String_Node_Str" + worldName;
        Map<String,Object> worldHomeWarpConfig=new Warp(this.plugin,TEMP_HOME_NAME,worldHome,this.playerName).getConfigurationMap();
        if (worldHomeWarpConfig != null) {
          this.generalConfig.setProperty(yamlKey,worldHomeWarpConfig);
        }
 else {
          OpenWarp.LOG.warning(OpenWarp.LOG_PREFIX + "String_Node_Str" + this.playerName+ "String_Node_Str");
          OpenWarp.LOG.warning(OpenWarp.LOG_PREFIX + "String_Node_Str" + this.playerName);
          return true;
        }
      }
    }
  }
  if (this.plugin.getLocationTracker().getPreviousLocation(this.playerName) != null) {
    Map<String,Object> backWarpConfig=new Warp(this.plugin,TEMP_BACK_NAME,this.plugin.getLocationTracker().getPreviousLocation(this.playerName),this.playerName).getConfigurationMap();
    if (backWarpConfig != null) {
      this.generalConfig.setProperty(OpenWarp.BACK_KEY,backWarpConfig);
    }
  }
  if (this.plugin.getLocationTracker().getLocationStack(this.playerName) != null) {
    Stack<Location> locationStack=this.plugin.getLocationTracker().getLocationStack(this.playerName);
    List<Map<String,Object>> locationStackConfig=new ArrayList<Map<String,Object>>();
    for (    Location location : locationStack) {
      locationStackConfig.add(new Warp(this.plugin,TEMP_STACK_NAME,location,this.playerName).getConfigurationMap());
    }
    if (locationStackConfig.size() > 0) {
      this.generalConfig.setProperty(OpenWarp.STACK_KEY,locationStackConfig);
    }
 else {
      this.generalConfig.setProperty(OpenWarp.STACK_KEY,null);
    }
  }
  this.quotaConfig.setProperty(OpenWarp.QUOTAS_KEY,this.plugin.getQuotaManager().getPlayerQuotaMap(this.playerName));
  return this.generalConfig.save() && this.warpConfig.save() && this.quotaConfig.save();
}