lvgl: use LV_INDEV_TYPE_BUTTON cause crash

I’m using a PC simulator. I want to use some hardware button. This is my configuration cause crash. (I use LV_INDEV_TYPE_POINT is normal.)

    lv_indev_drv_t indev_drv;
    lv_indev_drv_init(&indev_drv);          /*Basic initialization*/
    indev_drv.type = LV_INDEV_TYPE_BUTTON
    indev_drv.read = button_read;         /*This function will be called periodically (by the library) to get the mouse position and state*/
    lv_indev_drv_register(&indev_drv);

bool button_read(lv_indev_data_t*data)
{
    static uint32_t last_btn = 0;   /*Store the last pressed button*/ 
    int btn_pr = my_btn_read();     /*Get the ID (0,1,2...) of the pressed button*/
    if(btn_pr >= 0) {               /*Is there a button press?*/  
       last_btn = btn_pr;           /*Save the ID of the pressed button*/
       data->state = LV_INDEV_STATE_PR;  /*Set the pressed state*/
    } else {
       data->state = LV_INDEV_STATE_REL; /*Set the released state*/
    }
  
    data->btn = last_btn;            /*Set the last button*/         
   
    return false;                    /*No buffering so no more data read*/
}