Exception with activated Admin Panel on page with structured data

[brotkrueml]

Current behavior

With activated Admin Panel on a frontend web page an exception is thrown:

Argument 1 passed to TYPO3\CMS\Core\Utility\StringUtility::multibyteStringPad() must be of the type string, null given, called in /var/www/html/public/typo3/sysext/fluid/Classes/ViewHelpers/Format/PaddingViewHelper.php on line 106

Expected behavior/output

No exception occurs, the content of the web page is displayed and the Admin Panel works correctly.

Steps to reproduce

Open Admin Panel on a web page with structured data.

Environment

• schema version: 2.0.2
• TYPO3 versions: 11.5.0, 11.5.1
• Is your TYPO3 installation set up with Composer (Composer Mode): yes
• OS: Debian 10

Possible Solution

The bug is fixed with the next TYPO3 release (11.5.2), see: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71839

As an intermediate solution, a value with an empty string can be adding when using the PaddingViewHelper in Resources/Private/Templates/AdminPanel/TypesInformation.html