Error when saving form with multicheckbox

[SimonMayr]

Hello everyone,

when submitting a form with a multicheckbox the following error is thrown: htmlspecialchars(): Argument 1 ($string) must be of type string, array given in /frp_form_answers/Classes/Domain/Finishers/SaveFormToDatabaseFinisher.php line 133
The following code worked for me and might be a suggestion for a potential fix:

if (is_array($valuesWithPages[$pageElem->getIdentifier()])) {
    $values[$pageElem->getIdentifier()]['value'] = htmlspecialchars(implode(' | ', $valuesWithPages[$pageElem->getIdentifier()]));
} else {
    $values[$pageElem->getIdentifier()]['value'] = htmlspecialchars($valuesWithPages[$pageElem->getIdentifier()]);
}