From 7f98c3028109c361ca68e445690b4f05be3cedf1 Mon Sep 17 00:00:00 2001
From: Bruce Weirdan <weirdan@gmail.com>
Date: Sat, 24 Dec 2022 13:11:38 -0400
Subject: [PATCH] Backport changes from spatie/array-to-xml#204

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

diff --git a/src/ArrayToXml.php b/src/ArrayToXml.php
index 8eba571..4a0a457 100644
--- a/src/ArrayToXml.php
+++ b/src/ArrayToXml.php
@@ -241,7 +241,7 @@ protected function isArrayAllKeySequential($value)
     protected function addAttributes(DOMElement $element, array $data)
     {
         foreach ($data as $attrKey => $attrVal) {
-            $element->setAttribute($attrKey, $attrVal);
+            $element->setAttribute($attrKey, $attrVal ?? '');
         }
     }