Internal error

Detected bug in an extension! Hook IpbWiki_AutoAuthenticate13 failed to return a value; should return true to continue hook processing or false to abort.

Backtrace:

#0 /home/lentwort/pumapeople.com/wiki/includes/User.php(810): wfRunHooks('UserLoadFromSes...', Array)
#1 /home/lentwort/pumapeople.com/wiki/includes/User.php(260): User_Orig->loadFromSession()
#2 /home/lentwort/pumapeople.com/wiki/includes/User.php(1989): User_Orig->load()
#3 /home/lentwort/pumapeople.com/wiki/includes/User.php(2002): User_Orig->getGroups()
#4 /home/lentwort/pumapeople.com/wiki/includes/User.php(1975): User_Orig->getEffectiveGroups()
#5 /home/lentwort/pumapeople.com/wiki/includes/User.php(2125): User_Orig->getRights()
#6 [internal function]: User_Orig->isAllowed('read')
#7 /home/lentwort/pumapeople.com/wiki/includes/StubObject.php(58): call_user_func_array(Array, Array)
#8 /home/lentwort/pumapeople.com/wiki/includes/StubObject.php(184): StubObject->_call('isAllowed', Array)
#9 /home/lentwort/pumapeople.com/wiki/includes/Title.php(1523): StubUser->__call('isAllowed', Array)
#10 /home/lentwort/pumapeople.com/wiki/includes/Title.php(1523): StubUser->isAllowed('read')
#11 /home/lentwort/pumapeople.com/wiki/includes/Wiki.php(151): Title->userCanRead()
#12 /home/lentwort/pumapeople.com/wiki/includes/Wiki.php(55): MediaWiki->preliminaryChecks(Object(Title), Object(OutputPage), Object(WebRequest))
#13 /home/lentwort/pumapeople.com/wiki/index.php(116): MediaWiki->initialize(Object(Title), NULL, Object(OutputPage), Object(User), Object(WebRequest))
#14 {main}