Wikimedia Bugzilla is closed!

Although tenwiki has been closed, http://ten.wikipedia.org/wiki/Special:RenameUser offered a button to rename a user which I curiously tried to do, that was the result:

#0 /usr/local/apache/common-local/php-1.18/extensions/CentralAuth/CentralAuthUser.php(879): CentralAuthUser::validateList(Array)
#1 /usr/local/apache/common-local/php-1.18/extensions/CentralAuth/CentralAuthHooks.php(374): CentralAuthUser->adminUnattach(Array)
#2 [internal function]: CentralAuthHooks::onRenameUserPreRename('612', 'Mietchen', 'Daniel Mietchen')
#3 /usr/local/apache/common-local/php-1.18/includes/Hooks.php(216): call_user_func_array('CentralAuthHook...', Array)
#4 /usr/local/apache/common-local/php-1.18/includes/GlobalFunctions.php(3626): Hooks::run('RenameUserPreRe...', Array)
#5 /usr/local/apache/common-local/php-1.18/extensions/Renameuser/Renameuser_body.php(412): wfRunHooks('RenameUserPreRe...', Array)
#6 /usr/local/apache/common-local/php-1.18/extensions/Renameuser/Renameuser_body.php(251): RenameuserSQL->rename()
#7 /usr/local/apache/common-local/php-1.18/includes/SpecialPageFactory.php(460): SpecialRenameuser->execute(NULL)
#8 /usr/local/apache/common-local/php-1.18/includes/Wiki.php(240): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#9 /usr/local/apache/common-local/php-1.18/includes/Wiki.php(640): MediaWiki->performRequest()
#10 /usr/local/apache/common-local/php-1.18/includes/Wiki.php(547): MediaWiki->main()
#11 /usr/local/apache/common-local/php-1.18/index.php(57): MediaWiki->run()
#12 /usr/local/apache/common-local/live-1.5/index.php(3): require('/usr/local/apac...')
#13 {main}