if (instance_exists(obj_purpleheart))
{
    op = obj_purpleheart;
    if (hspeed > 0 && x > (op.xmid + (op.xlen * 2)))
        instance_destroy();
    if (hspeed < 0 && x < (op.xmid - (op.xlen * 2)))
        instance_destroy();
}
else
{
    instance_destroy();
}