Scalr\Model\AbstractEntity::__unset PHP Method

    public function __unset($prop)
    {
        if (property_exists($this, $prop)) {
            if (isset($this->{$prop})) {
                $this->{$prop} = null;
            }
        }
        throw new BadMethodCallException(sprintf('Property "%s" does not exist for the class "%s".', $prop, get_class($this)));
    }