if ( $subpageSearch !== null ) {
// Try matching the full search string as a page name
$specialTitle = Title::makeTitleSafe( NS_SPECIAL, $searchKey );
+ if ( !$specialTitle ) {
+ return array();
+ }
$special = SpecialPageFactory::getPage( $specialTitle->getText() );
if ( $special ) {
$subpages = $special->prefixSearchSubpages( $subpageSearch, $limit );