private function run( $resultPageSet = null ) {
$params = $this->extractRequestParams();
- $categoryTitle = $this->getTitleOrPageId( $params );
+ $categoryTitle = $this->getTitleOrPageId( $params )->getTitle();
if ( $categoryTitle->getNamespace() != NS_CATEGORY ) {
$this->dieUsage( 'The category name you entered is not valid', 'invalidcategory' );
}