Program: 68969
Project: 68969
Buggy source:
public static void storeGameByPrompting(){
  Game game=new Game();
  game.addProperty("String_Node_Str","String_Node_Str");
  game.addProperty("String_Node_Str","String_Node_Str");
  game.addProperty("String_Node_Str","String_Node_Str");
  game.addProperty("String_Node_Str","String_Node_Str");
  game.addProperty("String_Node_Str","String_Node_Str");
  game.addProperty("String_Node_Str","String_Node_Str");
  BoardHistoryList historyList=board.getHistory();
  BoardHistoryNode initialNode=historyList.getInitialNode();
  GameNode previousNode=null;
  for (BoardHistoryNode p=initialNode; p != null; p=p.next()) {
    GameNode gameNode=new GameNode(previousNode);
    if (previousNode == null) {
      game.setRootNode(gameNode);
    }
    if (Objects.equals(p.getData().lastMoveColor,Stone.BLACK) || Objects.equals(p.getData().lastMoveColor,Stone.WHITE)) {
      int x, y;
      if (p.getData().lastMove == null) {
        x=19;
        y=19;
      }
 else {
        x=p.getData().lastMove[0];
        y=p.getData().lastMove[1];
        if (x < 0 || x >= 19 || y < 0 || y >= 19) {
          x=19;
          y=19;
        }
      }
      String moveKey=Objects.equals(p.getData().lastMoveColor,Stone.BLACK) ? "String_Node_Str" : "String_Node_Str";
      String moveValue=Util.coordToAlpha.get(x) + Util.coordToAlpha.get(y);
      gameNode.addProperty(moveKey,moveValue);
    }
    if (p.getData().moveNumber > 0) {
      gameNode.setMoveNo(p.getData().moveNumber);
    }
    if (previousNode != null) {
      previousNode.addChild(gameNode);
    }
    previousNode=gameNode;
  }
  game.postProcess();
  FileNameExtensionFilter filter=new FileNameExtensionFilter("String_Node_Str","String_Node_Str");
  JFileChooser chooser=new JFileChooser(optionSetting.getLastChooserLocation());
  chooser.setFileFilter(filter);
  chooser.setMultiSelectionEnabled(false);
  int result=chooser.showSaveDialog(frame);
  if (result == JFileChooser.APPROVE_OPTION) {
    File file=chooser.getSelectedFile();
    optionSetting.setLastChooserLocation(file.getParent());
    if (file.exists()) {
      int ret=JOptionPane.showConfirmDialog(frame,"String_Node_Str","String_Node_Str",JOptionPane.OK_CANCEL_OPTION);
      if (ret == JOptionPane.CANCEL_OPTION) {
        return;
      }
    }
    if (!file.getPath().toLowerCase().endsWith("String_Node_Str")) {
      file=new File(file.getPath() + "String_Node_Str");
    }
    try {
      Sgf.writeToFile(game,file.toPath());
    }
 catch (    Exception e) {
      JOptionPane.showMessageDialog(frame,"String_Node_Str" + e.getMessage(),"String_Node_Str",JOptionPane.ERROR_MESSAGE);
    }
  }
}

Fixed version (ground truth):
public static void storeGameByPrompting(){
  Game game=new Game();
  game.addProperty("String_Node_Str","String_Node_Str");
  game.addProperty("String_Node_Str","String_Node_Str");
  game.addProperty("String_Node_Str","String_Node_Str");
  game.addProperty("String_Node_Str","String_Node_Str");
  game.addProperty("String_Node_Str","String_Node_Str");
  game.addProperty("String_Node_Str","String_Node_Str");
  BoardHistoryList historyList=board.getHistory();
  BoardHistoryNode initialNode=historyList.getInitialNode();
  GameNode previousNode=null;
  for (BoardHistoryNode p=initialNode.next(); p != null; p=p.next()) {
    GameNode gameNode=new GameNode(previousNode);
    if (previousNode == null) {
      game.setRootNode(gameNode);
    }
    if (Objects.equals(p.getData().lastMoveColor,Stone.BLACK) || Objects.equals(p.getData().lastMoveColor,Stone.WHITE)) {
      int x, y;
      if (p.getData().lastMove == null) {
        x=19;
        y=19;
      }
 else {
        x=p.getData().lastMove[0];
        y=p.getData().lastMove[1];
        if (x < 0 || x >= 19 || y < 0 || y >= 19) {
          x=19;
          y=19;
        }
      }
      String moveKey=Objects.equals(p.getData().lastMoveColor,Stone.BLACK) ? "String_Node_Str" : "String_Node_Str";
      String moveValue=Util.coordToAlpha.get(x) + Util.coordToAlpha.get(y);
      gameNode.addProperty(moveKey,moveValue);
    }
    if (p.getData().moveNumber > 0) {
      gameNode.setMoveNo(p.getData().moveNumber);
    }
    if (previousNode != null) {
      previousNode.addChild(gameNode);
    }
    previousNode=gameNode;
  }
  FileNameExtensionFilter filter=new FileNameExtensionFilter("String_Node_Str","String_Node_Str");
  JFileChooser chooser=new JFileChooser(optionSetting.getLastChooserLocation());
  chooser.setFileFilter(filter);
  chooser.setMultiSelectionEnabled(false);
  int result=chooser.showSaveDialog(frame);
  if (result == JFileChooser.APPROVE_OPTION) {
    File file=chooser.getSelectedFile();
    optionSetting.setLastChooserLocation(file.getParent());
    if (!file.getPath().toLowerCase().endsWith("String_Node_Str")) {
      file=new File(file.getPath() + "String_Node_Str");
    }
    if (file.exists()) {
      int ret=JOptionPane.showConfirmDialog(frame,"String_Node_Str","String_Node_Str",JOptionPane.OK_CANCEL_OPTION);
      if (ret == JOptionPane.CANCEL_OPTION) {
        return;
      }
    }
    try {
      Sgf.writeToFile(game,file.toPath());
    }
 catch (    Exception e) {
      JOptionPane.showMessageDialog(frame,"String_Node_Str" + e.getMessage(),"String_Node_Str",JOptionPane.ERROR_MESSAGE);
    }
  }
}