public function getPreviousStep()
    {
        $steps = MultiFormStep::get()->filter('SessionID', $this->SessionID)->sort('LastEdited', 'DESC');

        if ($steps) {
            foreach ($steps as $step) {
                $step->setForm($this->form);

                if ($step->getNextStep()) {
                    if ($step->getNextStep() == static::class) {
                        return get_class($step);
                    }
                }
            }
        }
    }