public function passive($field = null) {
		if (!$field) {
			$field = $this->getConfig('dummyField') ?: 'email_homepage';
		}
		$dummyFields = (array)$field;

		$html = [];
		foreach ($dummyFields as $dummyField) {
			$html[] = '<div style="display: none">' . $this->Form->control($dummyField, ['value' => '']) . '</div>';
		}
		return implode(PHP_EOL, $html);
	}