From 00cd346255fd5b1aa758a362c2ae2cfb2522e961 Mon Sep 17 00:00:00 2001
From: Philipp <admin@philipp.info>
Date: Wed, 5 Jul 2023 22:02:58 +0200
Subject: [PATCH] Fix XML deprecation

---
 src/Util/XML.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Util/XML.php b/src/Util/XML.php
index e5fa4009f3..c35f19b8a8 100644
--- a/src/Util/XML.php
+++ b/src/Util/XML.php
@@ -118,7 +118,7 @@ class XML
 						$namespace = null;
 					}
 
-					$element->addAttribute($attr_key, $attr_value, $namespace);
+					$element->addAttribute($attr_key, $attr_value ?? '', $namespace);
 				}
 
 				continue;