TYPO3 Core

After Upgrading to TYPO3 v9.5.6 i get the php Warning:

(1/1) #1476107295 TYPO3\CMS\Core\Error\Exception
PHP Warning: strpos(): Empty needle in /vagrant/htdocs/typo3/sysext/core/Classes/Routing/PageRouter.php line 126

It only occurs on Subpages (obviously) where the PageRouter is used.

The normalizedParams (scriptName) ist an empty string.

Im using nginx with php-fpm (7.3).

Debug of some of my $_SERVER values.

• $_SERVER['ORIG_PATH_INFO'] => not set
• $_SERVER['PATH_INFO'] => empty string
• $_SERVER['ORIG_SCRIPT_NAME'] => not set
• $_SERVER['SCRIPT_NAME'] => '/index.php' (10 chars)

To avoid the error:
1. Set TYPO4 to Live Mode in Install Tools Configuration Presets
or
2. Replace the if condition in line 136 with:
if (!empty($scriptName) && strpos($urlPath, $scriptName) !== false) {