Invalid input

Backtrace:

#0 /usr/local/apache/common-local/php-1.17/extensions/CentralAuth/CentralAuthUser.php(861): CentralAuthUser::validateList(Array)
#1 /usr/local/apache/common-local/php-1.17/extensions/CentralAuth/CentralAuthHooks.php(351): CentralAuthUser->adminUnattach(Array)
#2 [internal function]: CentralAuthHooks::onRenameUserPreRename('122', 'White Cat', '???????????????...')
#3 /usr/local/apache/common-local/php-1.17/includes/Hooks.php(158): call_user_func_array(Array, Array)
#4 /usr/local/apache/common-local/php-1.17/extensions/Renameuser/Renameuser_body.php(415): wfRunHooks('RenameUserPreRe...', Array)
#5 /usr/local/apache/common-local/php-1.17/extensions/Renameuser/Renameuser_body.php(260): RenameuserSQL->rename()
#6 /usr/local/apache/common-local/php-1.17/includes/SpecialPage.php(578): SpecialRenameuser->execute(NULL)
#7 /usr/local/apache/common-local/php-1.17/includes/Wiki.php(251): SpecialPage::executePath(Object(Title))
#8 /usr/local/apache/common-local/php-1.17/includes/Wiki.php(63): MediaWiki->handleSpecialCases(Object(Title), Object(OutputPage), Object(WebRequest))
#9 /usr/local/apache/common-local/php-1.17/index.php(114): MediaWiki->performRequestForTitle(Object(Title), NULL, Object(OutputPage), Object(User), Object(WebRequest))
#10 /usr/local/apache/common-local/live-1.5/index.php(3): require('/usr/local/apac...')
#11 {main}