today i updated to 11.5.30 my installation to typo3 11.5.30 and Bootstrap 14.0.6. now some pages with text content does not work anymore.
Core: Exception handler (WEB): Uncaught TYPO3 Exception: Call to undefined function TYPO3\HtmlSanitizer\Serializer\mb_split() | Error thrown in file /var/www/html/typo3_src-11.5.30/vendor/typo3/html-sanitizer/src/Serializer/Rules.php in line 187.
can you help?
The error occurs in the typo3/html-sanitizer package and was recently fixed:
This has been released with version 2.1.3 of the package, so you should update accordingly.
On that note: TYPO3v12+ will require the PHP mbstring extension so you can already prepare for that by making sure it is enabled.