From 3e522ed5126a840687c8be56ce0b47f2acff0337 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roland=20H=C3=A4der?= <roland@mxchange.org>
Date: Tue, 21 Jun 2022 01:41:34 +0200
Subject: [PATCH] Fixed: - prevent NULL from being handled over to
 XML::escape() - still I wonder that an object can be? It is a string-only
 accepting method

---
 src/Util/XML.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Util/XML.php b/src/Util/XML.php
index 76947e9431..734fd9298a 100644
--- a/src/Util/XML.php
+++ b/src/Util/XML.php
@@ -56,7 +56,7 @@ class XML
 					$root = new SimpleXMLElement('<' . $key . '/>');
 					self::fromArray($value, $root, $remove_header, $namespaces, false);
 				} else {
-					$root = new SimpleXMLElement('<' . $key . '>'.self::escape($value).'</' . $key . '>');
+					$root = new SimpleXMLElement('<' . $key . '>' . self::escape($value ?? '') . '</' . $key . '>');
 				}
 
 				$dom = dom_import_simplexml($root)->ownerDocument;
@@ -124,7 +124,7 @@ class XML
 			}
 
 			if (!is_array($value)) {
-				$element = $xml->addChild($key, self::escape($value), $namespace);
+				$element = $xml->addChild($key, self::escape($value ?? ''), $namespace);
 			} elseif (is_array($value)) {
 				$element = $xml->addChild($key, null, $namespace);
 				self::fromArray($value, $element, $remove_header, $namespaces, false);