TYPO3 Exception: Call to undefined method TYPO3\CMS\Core\Routing\SiteRouteResult::getPageId() in TYPO3 10/11

[fgerards]

in the middleware, it is assumed , that $pageArguments is an object of type PageArguments, which is NOT true for TYPO3 10/11 as the middleware is inserted after typo3/cms-frontend/site and BEFORE any TSFE initialization, which causes the object to be of type "SiteRouteResult", so there is NO page-ID present.

please correct that. if you place your middleware after tsfe-initialization, you might run into issues, where language fallbacks are already applied in typo3/cms-redirects/redirecthandler or any other middleware