Stack smashing when declaring new member attribute

Question

When I am declaring a new member attribute in my game.cpp class like this:

    int test;

I have a stack smashing error which is really strange because without the new attribute my program is running fine. I know my problem is probably somewhere else in my program and I will not copy my whole program but some help about how to make the message more explicit and maybe some advice about stack smashing debugging would be nice. This is my game.cpp class in case. Sorry if I am missing something important I am a beginner in c++. Thank you

My error:

* stack smashing detected *: terminated Aborted (core dumped)

Game.cpp

public:
    std::vector<Ball> m_balls; //list of ball in the current game, in case ball split in 3 energy ball
    std::vector<Vault> m_vaults; //list of vaults , in case we are in cooperative mode
    std::vector<Wall> m_walls; // lists of walls
    int test; //Stack smashing wtf
    Sdl_o_surface m_bg; // image containing sprites
    Sdl_o_window m_window; //window containing one or more games (for the moment 1 or 2)
    int score = 0;
    int m_current_level = 1;
    int m_x1; // borders of the game
    int m_x2;
    int m_y1;
    int m_y2;

    //constructor
    Game(int x1, int x2 , int y1, int y2, int mode, Sdl_o_surface s,  Sdl_o_window w);

    //methods
    void initSolo();
    void initCoop();
    void refreshWindowAndObjects();
    void startGame();
    void updatePosition();
    void wallsCollision(Ball &ball);
    void borderCollision(Ball &ball);
    void vaultCollision(Ball &ball);
    Sdl_o_rectangle getTexturePosition(); //get texture position depending on current level
    Sdl_o_rectangle getBorders();
    void parseLevelText();
    void updateVaultsPosition(int x, int y);

    //wall section
    void chooseWallType(char type);
    void placeWall(char t);