From a76cc44a607ed47fa8a12222c989dbd8cad6a212 Mon Sep 17 00:00:00 2001
From: Reedy <reedy@wikimedia.org>
Date: Wed, 23 Oct 2024 15:15:39 +0000
Subject: [PATCH] SpecialNotificationsMarkRead: Don't pass null to explode()

Bug: T377920
Change-Id: I426c76dbf2e8da4563e93fefe6bd628faa0e13b7
---
 includes/Special/SpecialNotificationsMarkRead.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/includes/Special/SpecialNotificationsMarkRead.php b/includes/Special/SpecialNotificationsMarkRead.php
index 80accfd6e..8932dd1a4 100644
--- a/includes/Special/SpecialNotificationsMarkRead.php
+++ b/includes/Special/SpecialNotificationsMarkRead.php
@@ -54,7 +54,7 @@ class SpecialNotificationsMarkRead extends FormSpecialPage {
 				'default' => $this->par,
 				'filter-callback' => static function ( $value, $alldata ) {
 					// Allow for a single value or a set of values
-					return explode( ',', $value );
+					return explode( ',', $value ?? '' );
 				},
 				'validation-callback' => function ( $value, $alldata ) {
 					if ( $value === [ 'ALL' ] ) {