From 09c1eccb50ec27cd9588b2238d860a32d19a6826 Mon Sep 17 00:00:00 2001
From: Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
Date: Wed, 4 Oct 2023 18:14:48 +0200
Subject: [PATCH] LibWeb: Fix crash in XMLHttpRequest::response_xml() if
 response empty

If response object is empty we should return nullptr.

Fixes crash on https://store.steampowered.com/
---
 Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
index 75149cb73b..1dde00f7f2 100644
--- a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
+++ b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
@@ -144,6 +144,8 @@ WebIDL::ExceptionOr<JS::GCPtr<DOM::Document>> XMLHttpRequest::response_xml()
     set_document_response();
 
     // 6. Return this’s response object.
+    if (m_response_object.has<Empty>())
+        return nullptr;
     return &verify_cast<DOM::Document>(m_response_object.get<JS::Value>().as_object());
 }