diff --git a/includes/PrefixSearch.php b/includes/PrefixSearch.php
index 55a4f49b346..430b4b8972d 100644
--- a/includes/PrefixSearch.php
+++ b/includes/PrefixSearch.php
@@ -362,7 +362,11 @@ abstract class PrefixSearch {
 			$ns = NS_MAIN; // if searching on many always default to main
 		}
 
-		$t = Title::newFromText( $search, $ns );
+		$t = null;
+		if ( is_string( $search ) ) {
+			$t = Title::newFromText( $search, $ns );
+		}
+
 		$prefix = $t ? $t->getDBkey() : '';
 		$dbr = wfGetDB( DB_SLAVE );
 		$res = $dbr->select( 'page',