From d371d233829b47675dc4132b4c2dffbe68e4d381 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Mon, 31 Dec 2018 12:57:37 +0100
Subject: [PATCH] Prevent errors in various methods in `SimpleDOMNode` when the
 `childNodes` property is not defined (issue 10395)

Given that the issue, as filed, is incomplete since no PDF file was provided for debugging, this patch is really the best that we can do here. *Please note:* This patch will *not* enable the Metadata to be successfully parsed, but it should at least prevent the errors.
---
 src/display/xml_parser.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/display/xml_parser.js b/src/display/xml_parser.js
index 1cbb019c5..f4080e056 100644
--- a/src/display/xml_parser.js
+++ b/src/display/xml_parser.js
@@ -278,12 +278,16 @@ class SimpleDOMNode {
   }
 
   get firstChild() {
-    return this.childNodes[0];
+    return this.childNodes && this.childNodes[0];
   }
 
   get nextSibling() {
-    let index = this.parentNode.childNodes.indexOf(this);
-    return this.parentNode.childNodes[index + 1];
+    const childNodes = this.parentNode.childNodes;
+    if (!childNodes) {
+      return undefined;
+    }
+    const index = childNodes.indexOf(this);
+    return childNodes[index + 1];
   }
 
   get textContent() {