private function checkTaxonomy()
    {
        foreach ($this->data['taxonomy'] as $key => $taxonomy) {
            if (empty($taxonomy['options']) || !is_array($taxonomy['options'])) {
                continue;
            }

            foreach ($taxonomy['options'] as $optionKey => $optionValue) {
                if (strpos($optionKey, '/') === false) {
                    continue;
                }

                $this->passed = false;
                $error = Trans::__(
                    'general.phrase.invalid-taxonomy-slug',
                    ['%taxonomy%' => $key, '%option%' => $optionValue]
                );
                $this->app['logger.flash']->error($error);
            }
        }

        return $this->passed;
    }