尝试读取精灵时出错

Question

我试图阅读并显示一个精灵，但我得到的只是这个错误：

Exception in thread "Thread-2" java.lang.NullPointerException
    at Game.MainCharacter.render(MainCharacter.java:44)
    at Game.Game.render(Game.java:105)
    at Game.Game.run(Game.java:149)
    at java.lang.Thread.run(Unknown Source)

精灵正确打开（我查了一下），但我不知道在哪里遗忘了......

以下是使用的类（我只编写了使用的代码）： GlobalTextures类 - 包含我所有的spritesheeets

package Game;

import java.awt.image.BufferedImage;

public class GlobalTextures {
    public BufferedImage player;

    private SpriteSheet character;

    public GlobalTextures(Game game) {
        character = new SpriteSheet(game.getCharacterSpriteSheet());
        getTextures();
    }

    private void getTextures() {
        player = character.getSprite(1, 1, 333, 472);
        if(player == null) System.out.println("It doesn't exist");
    }
}

玩家等级 - 在那里我打开角色，我90％确定有错误，但我不知道为什么......

package Game;

import java.awt.Graphics;
import java.awt.image.BufferedImage;

public class MainCharacter extends GameObject implements Entity{


    public MainCharacter(double x, double y, GlobalTextures tex) {
        super(x, y, tex);
    }

    public void render(Graphics g) {

        Game game = new Game();
        g.drawImage(tex.player, (int)x, (int) y, null);

    }

}

精灵类 - 在这里我得到精灵并返回角色

package Game;

import java.awt.image.BufferedImage;

public class SpriteSheet {

    private BufferedImage image;

    public SpriteSheet(BufferedImage image)
    {
        this.image = image;
    }

    public BufferedImage getSprite(int col, int row, int width, int height)
    {
        BufferedImage img = image.getSubimage((col * 2000) - 2000, (row * 2829) - 2829, width, height);
        return img;
    }

}

/////////////////////////////////////////////// /////////////////////////////////

package Game;

public class GameObject {
    protected double x;
    protected double y;
    protected GlobalTextures tex;

    public GameObject(double x, double y, GlobalTextures tex){
        this.x = x;
        this.y = y;
        this.tex = tex;
    }

}