From f312e1602dd6cace3c18da3589375ebbe410f996 Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Fri, 4 Aug 2023 13:16:43 +0200
Subject: [PATCH] Fix the handling of `NULL` values

See https://www.woltlab.com/community/thread/300917-neue-benutzergruppe-anlegen-funktioniert-nicht-mit-php-8-1x/
---
 .../system/option/LineBreakSeparatedTextOptionType.class.php    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wcfsetup/install/files/lib/system/option/LineBreakSeparatedTextOptionType.class.php b/wcfsetup/install/files/lib/system/option/LineBreakSeparatedTextOptionType.class.php
index 2144c49ae4..b6d71658e5 100644
--- a/wcfsetup/install/files/lib/system/option/LineBreakSeparatedTextOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/LineBreakSeparatedTextOptionType.class.php
@@ -23,7 +23,7 @@ class LineBreakSeparatedTextOptionType extends TextareaOptionType
      */
     public function getFormElement(Option $option, $value)
     {
-        $values = ArrayUtil::trim(\explode("\n", StringUtil::unifyNewlines($value)));
+        $values = ArrayUtil::trim(\explode("\n", StringUtil::unifyNewlines($value ?? '')));
         \uasort($values, 'strnatcmp');
 
         static $identifiers = [];
-- 
2.20.1