diff --git a/classes/search/ArticleSearch.inc.php b/classes/search/ArticleSearch.inc.php
index 772925bb79..2ec77ad55f 100644
--- a/classes/search/ArticleSearch.inc.php
+++ b/classes/search/ArticleSearch.inc.php
@@ -25,9 +25,8 @@ function getSparseArray($unorderedResults, $orderBy, $orderDir, $exclude) {
 		// Calculate a well-ordered (unique) score.
 		$resultCount = count($unorderedResults);
 		$i = 0;
-		foreach ($unorderedResults as $submissionId => &$data) {
-			// Reference is necessary to permit modification
-			$data['score'] = ($resultCount * $data['count']) + $i++;
+		foreach ($unorderedResults as $submissionId => $data) {
+			$data[$submissionId]['score'] = ($resultCount * $data['count']) + $i++;
 		}
 
 		// If we got a primary sort order then apply it and use score as secondary
@@ -210,7 +209,7 @@ function getKeywordsFromSearchFilters($searchFilters) {
 		$indexFieldMap[SUBMISSION_SEARCH_INDEX_TERMS] = 'indexTerms';
 		$keywords = array();
 		if (isset($searchFilters['query'])) {
-			$keywords[null] = $searchFilters['query'];
+			$keywords[''] = $searchFilters['query'];
 		}
 		foreach($indexFieldMap as $bitmap => $searchField) {
 			if (isset($searchFilters[$searchField]) && !empty($searchFilters[$searchField])) {
diff --git a/lib/pkp b/lib/pkp
index 437aff5056..1b0da6f2df 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit 437aff50561641e614d75863c57e60c976425000
+Subproject commit 1b0da6f2df9ba6170755507857a182916e6bba0a