if (instance_exists(obj_mainchara))
{
    if (follow == 1 && obj_mainchara.visible == true)
    {
        depth = obj_mainchara.depth - 4;
        x = obj_mainchara.x + (obj_mainchara.sprite_width / 2);
        y = (obj_mainchara.y - 6) + yoffset;
    }
}
else
{
    instance_destroy();
}