If you try to view a subversion commit, you get a Runtime Exception with the stacktrace below :
PHP message: [2023-08-16 15:45:00] EXCEPTION: (RuntimeException) strlen(): Passing null to parameter #1 ($string) of type string is deprecated at [<arcanist>/src/error/PhutilErrorHandler.php:261]; PHP message: arcanist(head=master, ref.master=df6c315ace5f), phorge(head=master, ref.master=9fa9aa30b940); PHP message: #0 <#2> PhutilErrorHandler::handleError(integer, string, string, integer) called at [<phorge>/src/applications/diffusion/data/DiffusionCommitRef.php:134]; PHP message: #1 <#2> DiffusionCommitRef::formatUser(NULL, NULL) called at [<phorge>/src/applications/diffusion/data/DiffusionCommitRef.php:125]; PHP message: #2 <#2> DiffusionCommitRef::getCommitter() called at [<phorge>/src/applications/repository/storage/PhabricatorRepositoryCommitData.php:133]; PHP message: #3 <#2> PhabricatorRepositoryCommitData::getCommitterString() called at [<phorge>/src/applications/repository/storage/PhabricatorRepositoryCommit.php:528]; PHP message: #4 <#2> PhabricatorRepositoryCommit::getRawCommitterStringForDisplay() called at [<phorge>/src/applications/repository/storage/PhabricatorRepositoryCommit.php:495]; PHP message: #5 <#2> PhabricatorRepositoryCommit::newCommitCommitterView(PhabricatorUser) called at [<phorge>/src/applications/diffusion/controller/DiffusionCommitController.php:636]; PHP message: #6 <#2> DiffusionCommitController::buildPropertyListView(PhabricatorRepositoryCommit, PhabricatorRepositoryCommitData, array) called at [<phorge>/src/applications/diffusion/controller/DiffusionCommitController.php:186]; PHP message: #7 <#2> DiffusionCommitController::handleRequest(AphrontRequest) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:284]; PHP message: #8 phlog(RuntimeException) called at [<phorge>/src/aphront/handler/PhabricatorDefaultRequestExceptionHandler.php:41];