PHP 8.1 :: TypeError | MForm\MFormElements::addHtml()

[skerbis]

addHtml() wird in meiner Moduleingabe nicht verwendet. Dennoch erhalte ich diesen Fehler:

19.07.2022, 11:47:19	TypeError	MForm\MFormElements::addHtml(): Argument #1 ($html) must be of type ?string, array given, called in /var/www/vhosts/2022.wdfv.de/httpdocs/redaxo/src/addons/mform/lib/MForm/MFormElements.php on line 191	redaxo/src/addons/mform/lib/MForm/MFormElements.php	93

Source:

$mform = new MForm();
$mform->addTextField("3.headline", ['label' => 'Headline']);
$mform->addTextField("3.subline", ['label' => 'Sub-Headline']);
$mform->addFieldsetArea('Text', ['class' => 'grey-legend-background']);

$mform->addTextAreaField("3.text", ['label' => 'Text', 'data-profile' => 'light', 'data-lang' => \Cke5\Utils\Cke5Lang::getUserLang(), 'class' => 'cke5-editor']);


$mform->addFieldsetArea('Button', ['class' => 'grey-legend-background']);
$mform->addCustomLinkField('2.link', ['label' => 'Link-Ziel', 'data-media' => 'disable']);
$mform->addTextField('2.link_text', ['label' => 'Link-Text']);

$mform->addFieldsetArea('Background (optional)', ['class' => 'grey-legend-background']);
$mform->addMediaField('1', ['label' => 'Hintergundbild']);

print $mform->show();