Wikimedia Bugzilla is closed!

Several users have reported receiving internal errors when attempting to load page histories, diffs or the edit window.  The message displayed is:

Detected bug in an extension! Hook CentralAuthHooks::onGetUserPermissionsErrorsExpensive failed to return a value; should return true to continue hook processing or false to abort.

Backtrace:

0 /usr/local/apache/common-local/php-1.5/includes/Title.php(1156): wfRunHooks('getUserPermissi...', Array) 
1 /usr/local/apache/common-local/php-1.5/includes/Title.php(1055): Title->getUserPermissionsErrorsInternal('rollback', Object(User), true) 
2 /usr/local/apache/common-local/php-1.5/includes/PageHistory.php(268): Title->getUserPermissionsErrors('rollback', Object(User)) 
3 /usr/local/apache/common-local/php-1.5/includes/PageHistory.php(621): PageHistory->historyLine(Object(stdClass), Object(stdClass), 1, false, true, true) 
4 /usr/local/apache/common-local/php-1.5/includes/Pager.php(270): PageHistoryPager->formatRow(Object(stdClass)) 
5 /usr/local/apache/common-local/php-1.5/includes/PageHistory.php(138): IndexPager->getBody() 
6 /usr/local/apache/common-local/php-1.5/includes/Wiki.php(503): PageHistory->history() 
7 /usr/local/apache/common-local/php-1.5/includes/Wiki.php(59): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest)) 
8 /usr/local/apache/common-local/php-1.5/index.php(92): MediaWiki->initialize(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest)) 
9 /usr/local/apache/common-local/live-1.5/index.php(3): require('/usr/local/apac...') 
10 {main}

and appears to be connected to CentralAuth: the common factor between the two users reporting the error is that a global account exists for the username, but the local account is not part of that global account.