From a7352f6f06d3404555d981d92b2eaf24a4f31517 Mon Sep 17 00:00:00 2001
From: Jonas Raoni Soares da Silva <github@raoni.org>
Date: Tue, 25 Jun 2024 14:17:38 +0300
Subject: [PATCH] pkp/pkp-lib#10111 Replaced null by an empty string

---
 classes/search/ArticleSearch.inc.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/classes/search/ArticleSearch.inc.php b/classes/search/ArticleSearch.inc.php
index 772925bb79..63dc02b3ca 100644
--- a/classes/search/ArticleSearch.inc.php
+++ b/classes/search/ArticleSearch.inc.php
@@ -210,7 +210,7 @@ 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])) {