Ошибка в openTile()

Написал до конца код и столкнулся с проблемой: на некоторые ячейки невозможно нажать то есть при нажатии на закрытую ячейку она не открываеться. Где ошибка в коде? package com.javarush.games.minesweeper; import com.javarush.engine.cell.*; import java.util.ArrayList; public class MinesweeperGame extends Game { private static final int SIDE = 9; private int countMinesOnField; private boolean isMine; private static final String MINE = "\uD83D\uDCA3"; private static final String FLAG = "\uD83D\uDEA9"; private int countFlags; private boolean isGameStopped; private int countClosedTiles = SIDE * SIDE; private int score; private GameObject[][] gameField = new GameObject[SIDE][SIDE]; @Override public void initialize() { setScreenSize(SIDE, SIDE); createGame(); } @Override public void onMouseLeftClick(int x, int y) { if (isGameStopped) { restart(); } else { openTile(x, y); } } private void createGame() { for (int i = 0; i < gameField.length; i ++) { for (int j = 0; j < gameField[i].length ; j ++) { if (getRandomNumber(10) == 1) { isMine = true; countMinesOnField++; } gameField[i][j] = new GameObject(j, i, isMine); setCellValue(i, j, ""); setCellColor(i, j, Color.ORANGE); isMine = false; } } countFlags = countMinesOnField; countMineNeighbors(); } private ArrayList<GameObject> getNeighbors(GameObject go) { ArrayList<GameObject> testList = new ArrayList<GameObject>(); for (int i = 0; i < SIDE; i++) { for (int j = 0; j < SIDE; j++) { if (go != gameField[i][j] && Math.abs(go.x - gameField[i][j].x) < 2 && Math.abs(go.y - gameField[i][j].y) < 2) { testList.add(gameField[i][j]); } } } return testList; } private void countMineNeighbors() { ArrayList<GameObject> testList = new ArrayList<GameObject>(); for (int i = 0; i < SIDE; i++) { for (int j = 0; j < SIDE; j++) { if (!gameField[i][j].isMine) { testList = getNeighbors(gameField[i][j]); for (GameObject go : testList) { if (go.isMine) { gameField[i][j].countMineNeighbors++; } } } } } } private void openTile(int x, int y){ if (gameField[x][y].isOpen || gameField[x][y].isFlag || isGameStopped){ } else if(gameField[y][x].isMine){ setCellValueEx(x, y, Color.RED, MINE); gameOver(); } else { gameField[y][x].isOpen=true; countClosedTiles--; setCellColor(x,y, Color.GREEN); score += 5; boolean notZero = gameField[x][y].countMineNeighbors!=0; if(notZero){ setCellNumber(x,y,gameField[x][y].countMineNeighbors); } else { ArrayList<GameObject> list3 = new ArrayList<GameObject>(); setCellValue(x,y,""); list3=getNeighbors(gameField[y][x]); for(int i=0; i<list3.size();i++){ int Xx=list3.get(i).x; int Yy=list3.get(i).y; if(!list3.get(i).isOpen){ openTile(Xx,Yy); } } } } if (countClosedTiles == countMinesOnField) { win(); } setScore(score); } private void markTile(int x, int y) { if (isGameStopped){ if (gameField[x][y].isOpen || (countFlags == 0 && !gameField[x][y].isFlag)) { } else if (!gameField[x][y].isFlag) { gameField[x][y].isFlag = true; countFlags--; setCellValue(x, y, FLAG); setCellColor(x, y, Color.YELLOW); } else if (gameField[x][y].isFlag) { gameField[x][y].isFlag = false; countFlags++; setCellValue(x, y, ""); setCellColor(x, y, Color.ORANGE); } } } @Override public void onMouseRightClick(int x, int y) { markTile(x, y); } private void gameOver() { showAllMines(); isGameStopped = true; showMessageDialog(Color.BLACK, "Over", Color.WHITE, 40); } private void win() { isGameStopped = true; showMessageDialog(Color.BLACK, "WIN", Color.WHITE, 40); } private void restart() { isGameStopped = false; countClosedTiles = SIDE * SIDE; score = 0; countMinesOnField = 0; setScore(score); createGame(); } private void showAllMines() { for (int i = 0; i < 9; i ++) { for (int j = 0; j < 9; j ++) { if (gameField[i][j].isMine) { setCellValueEx(i, j, Color.RED, MINE); } } } } }