diff --git a/public/app/themes/justice/inc/search.php b/public/app/themes/justice/inc/search.php
index b8a67f19..7f83f4ca 100644
--- a/public/app/themes/justice/inc/search.php
+++ b/public/app/themes/justice/inc/search.php
@@ -372,8 +372,7 @@ public function redirectIfQueryStringHasArrays(): void
             return;
         }
 
-        $query_string = $_SERVER['QUERY_STRING'];
-        $query_string = explode('&', $query_string);
+        $query_string = explode('&', $_SERVER['QUERY_STRING'] ?? '');
 
         foreach ($query_string as $query) {
             error_log($query);