Thread:Extension talk:Survey/Exception with mediawiki 1.22

Getting the following error when tying to view the Specials:Survey page:-

[815a4635] /wiki/index.php/Special:Surveys Exception from line 376 of /var/www/wiki/includes/SpecialPage.php: Call to undefined method SpecialSurveys::getPageTitle Backtrace:
 * 1) 0 /var/www/wiki/extensions/Survey/specials/SpecialSurveys.php(77): SpecialPage->__call(string, array)
 * 2) 1 /var/www/wiki/extensions/Survey/specials/SpecialSurveys.php(77): SpecialSurveys->getPageTitle
 * 3) 2 /var/www/wiki/extensions/Survey/specials/SpecialSurveys.php(54): SpecialSurveys->displayAddNewControl
 * 4) 3 /var/www/wiki/extensions/Survey/specials/SpecialSurveys.php(44): SpecialSurveys->displaySurveys
 * 5) 4 /var/www/wiki/includes/SpecialPage.php(631): SpecialSurveys->execute(NULL)
 * 6) 5 /var/www/wiki/includes/SpecialPageFactory.php(488): SpecialPage->run(NULL)
 * 7) 6 /var/www/wiki/includes/Wiki.php(298): SpecialPageFactory::executePath(Title, RequestContext)
 * 8) 7 /var/www/wiki/includes/Wiki.php(602): MediaWiki->performRequest
 * 9) 8 /var/www/wiki/includes/Wiki.php(467): MediaWiki->main
 * 10) 9 /var/www/wiki/index.php(49): MediaWiki->run
 * 11) 10 {main}

Any assistance would be greatly appreciated.