TYPO3 Core

I get many Errors of the following in the Backend:

Core: Error handler (BE): PHP Warning: vsprintf(): Too few arguments in /var/www/sites/muehlhof.ch/httpdocs/cms/typo3_src-6.2.4/typo3/sysext/belog/Classes/ViewHelpers/FormatDetailsViewHelper.php line 44

I found #46077 which reported similar errors and has been fixed by patching AbstractExceptionHandler.php

I found a similar line in ErrorHandler.php and by applying the following patch, the errors in the backend disappeared:

--- typo3/sysext/core/Classes/Error/ErrorHandler.php.orig    2014-08-21 17:01:38.173769303 +0200
+++ typo3/sysext/core/Classes/Error/ErrorHandler.php    2014-08-21 16:56:29.819744574 +0200
@@ -182,7 +182,7 @@
                 'action' => 0,
                 'error' => $severity,
                 'details_nr' => 0,
-                'details' => $logMessage,
+                'details' => str_replace('%', '%%', $logMessage),
                 'IP' => GeneralUtility::getIndpEnv('REMOTE_ADDR'),
                 'tstamp' => $GLOBALS['EXEC_TIME'],
                 'workspace' => $workspace

I'm not that familiar with the typo3-backend so I don't know the exact cause of these errors and wheater this is an appropriate fix for them.