Qt QGraphicsScene addItem() segmentation fault - c++

Question

In Game::Game i call shoot() who create and add to scene NormalBullet object.
#include "game.h"
#include <QDebug>
#include "dirtblock.h"
#include "normalbullet.h"
#include <QTimer>
Game::Game(QGraphicsView *parent)
: QGraphicsView(parent)
{
//set scene
scene = new QGraphicsScene(this);
scene->setSceneRect(0, 0, 500, 500);
setFixedSize(500, 500);
setScene(scene);
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
//set Player
player = new PlayerTank();
scene->addItem(player);
//set dirtblock test
DirtBlock * db = new DirtBlock();
db ->setPos(100, 100);
scene->addItem(db);
NormalBullet *bl = new NormalBullet();
bl->shot(QPointF(300,300), 90);
}
I have segmentation fault (signal name: SIGSEGV) when i try add to scene object NormalBullet *bullet in NormalBullet::shoot. I create 'test' variable to see on debuger what scene() return and turn out its 0x0. When i try get acess to scene by game->scene (test2), i have also segmentation fault. Why scene not return proper pointer?
#include "normalbullet.h"
#include "game.h"
#include "QTimer"
#include "dirtblock.h"
#include <QGraphicsScene>
extern Game * game;
NormalBullet::NormalBullet(QGraphicsPixmapItem *parent)
{
setPixmap(QPixmap(":/images/NormalBullet.png"));
damage = 10;
speed = 10;
}
void NormalBullet::shot(QPointF coord, qreal angle)
{
//create new bullet, setPos, add to scene and connect to timer
NormalBullet * bullet = new NormalBullet();
bullet->setPos(coord);
bullet->setRotation(angle);
//scene()->addItem(bullet);
auto test = scene(); //return 0x0
//auto test2 = game->scene; //<= segmentation fault
QTimer *tim = new QTimer();
connect(tim, &QTimer::timeout, bullet, &NormalBullet::move);
tim->start(200);
scene()->addItem(bullet);
}
#ifndef GAME_H
#define GAME_H
#include <QWidget>
#include <QGraphicsView>
#include <QGraphicsScene>
#include "playertank.h"
#include<QObject>
class Game : public QGraphicsView
{
Q_OBJECT
public:
Game(QGraphicsView *parent = nullptr);
void keyPressEvent(QKeyEvent *event) override;
QGraphicsScene *scene;
PlayerTank *player;
private:
};
#endif // GAME_H
For some reason I dont have access to scene pointer in NormalBullet and otcher class, except Game class.