From 73af2f8d02cfba1bf910d96bf955b1d6ce510a86 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Sat, 19 Oct 2019 21:20:42 +0200
Subject: [PATCH] LibHTML: DOM fixup should handle a completely empty document

We were forgetting to check if there was even a first child of the
root Document node.
---
 Libraries/LibHTML/DOM/Document.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Libraries/LibHTML/DOM/Document.cpp b/Libraries/LibHTML/DOM/Document.cpp
index ad2a552cfd..4856a71739 100644
--- a/Libraries/LibHTML/DOM/Document.cpp
+++ b/Libraries/LibHTML/DOM/Document.cpp
@@ -57,7 +57,7 @@ bool Document::is_child_allowed(const Node& node) const
 
 void Document::fixup()
 {
-    if (!is<DocumentType>(first_child()))
+    if (!first_child() || !is<DocumentType>(*first_child()))
         prepend_child(adopt(*new DocumentType(*this)));
 
     if (is<HTMLHtmlElement>(first_child()->next_sibling()))