Can not kill Carla by Python script when i set autopilot mode

[Youngzipper]

I am using CARLA 0.9.15 in Ubuntu 18.04 I write a python script to open carla、spawn vehicle、set autopilot、kill carla... repeatedly. But when i kill carla for the first round, error meassage was raised: aborted (core dumped). The weird thing is if i do not set autopilot, then the circulation can run, which is open carla、spawn vehicle、kill carla... My brief codes is as follows:

def find_and_kill_process(name, user=None):
    for proc in psutil.process_iter(['pid', 'name', 'username']):
        try:
            if user and proc.info['username'] != user:
                continue

            if name in proc.info['name']:
                print(proc.info['pid'], proc.info['name'])
                proc.kill()  
                print("force terminate process")
                proc.wait()      
                print("wait process close")
                print(f"Process with PID {proc.info['pid']} ({proc.info['name']}) terminated.")
        except (psutil.NoSuchProcess, psutil.AccessDenied, psutil.ZombieProcess):
            pass

def main():
    try:
        carla_server_path = '/home/user_name/CARLA/CarlaUE4.sh'
        subprocess.Popen(carla_server_path)
        time.sleep(5.0)
        client = carla.Client('localhost', 2000)
        world = client.load_world("Town04")

        x = random.choice([-337, -331, -325, -319])
        y = random.choice([26, 29.5, 33, 36.5])
        ego_location = carla.Location(x, y, z=3)
        ego_rotation = carla.Rotation(yaw=0)
        ego_spawn_point = carla.Transform(ego_location, ego_rotation)
        ego_bp = world.get_blueprint_library().find('vehicle.audi.etron')
        ego_bp.set_attribute('role_name', 'CAV')
        ego_vehicle = world.spawn_actor(ego_bp, ego_spawn_point)

        world.tick()

        ego_vehicle.set_autopilot(True) **# if delete this line, then the the script will run successfully**


        i = 0
        while True:
            i += 1
            time.sleep(1.0)
            if i == 5:
                break
       
            spectator = world.get_spectator()
            spectator_location = carla.Location(ego_vehicle.get_location().x, ego_vehicle.get_location().y, ego_vehicle.get_location().z + 100)
            spectator_rotation = carla.Rotation(pitch=-90)
            spectator_transform = carla.Transform(spectator_location, spectator_rotation)
            spectator.set_transform(spectator_transform)

    except:
        pass


  if __name__ == '__main__':
        for i in range(20):
            print(f"______________episode {i}__________________")
            main()
            find_and_kill_process("CarlaUE4-Linux-Shipping", "user_name")