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Mautic 4 Speichern von Formularen kommt ERROR 500

Mautic 4
My PHP version is 7.4 :
My MySQL/MariaDB version is (delete as applicable): MySQL/MariaDB version

Updating/Installing Errors
I am (delete as applicable): Updating
Upgrading/installing via (delete as applicable) : Web / Command Line

These errors are showing in the installer :

These errors are showing in the Mautic log :
[2021-09-16 13:45:51] mautic.CRITICAL: Uncaught PHP Exception Symfony\Component\Form\Exception\UnexpectedTypeException: “Expected argument of type “null or string”, “boolean” given” at /html/mautic_xy/vendor/symfony/form/Extension/Core/DataMapper/RadioListMapper.php line 49 {“exception”:"[object] (Symfony\Component\Form\Exception\UnexpectedTypeException(code: 0): Expected argument of type “null or string”, “boolean” given at /html/mautic_xy/vendor/symfony/form/Extension/Core/DataMapper/RadioListMapper.php:49)"}

Die Datei RadioListMapper hab ich im Anhang beigelegt.

`<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Form\Extension\Core\DataMapper;

use Symfony\Component\Form\DataMapperInterface;
use Symfony\Component\Form\Exception\UnexpectedTypeException;

/**
 * Maps choices to/from radio forms.
 *
 * A {@link ChoiceListInterface} implementation is used to find the
 * corresponding string values for the choices. The radio form whose "value"
 * option corresponds to the selected value is marked as selected.
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
class RadioListMapper implements DataMapperInterface
{
    /**
     * {@inheritdoc}
     */
    public function mapDataToForms($choice, $radios)
    {
        if (!\is_string($choice)) {
            throw new UnexpectedTypeException($choice, 'string');
        }

        foreach ($radios as $radio) {
            $value = $radio->getConfig()->getOption('value');
            $radio->setData($choice === $value);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function mapFormsToData($radios, &$choice)
    {
        if (null !== $choice && !\is_string($choice)) {
            throw new UnexpectedTypeException($choice, 'null or string');
        }

        $choice = null;

        foreach ($radios as $radio) {
            if ($radio->getData()) {
                if ('placeholder' === $radio->getName()) {
                    return;
                }

                $choice = $radio->getConfig()->getOption('value');

                return;
            }
        }
    }
}
`

Your problem
My problem is :
Beim Anlegen und Speichern eines Formulars kommt ERROR 500

Steps I have tried to fix the problem :

Das Problem hatte ich letztens auch, habe bisher aber noch keine Lösung.

Ich denke, daß es an dem Problem hier liegt:

Sobald ich den Rendering-Stil auf NEIN stelle und dann abspeichere, kommt die Fehlermeldung ERROR 500

Zum Testen hab ich ein Formular mit Renderig-Stil JA angelegt, da funktioniert es.

Nun will ich aber mein eigenes CSS nutzen, und darum Rendering-Stil NEIN.

Wer kann helfen?

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