diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index 91aeccbfa2..e8aa91f224 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -6648,7 +6648,8 @@ LengthOrCalculated Parser::Parser::parse_as_sizes_attribute()
         //    If it does not parse correctly, or it does parse correctly but the <media-condition> evaluates to false, continue.
         TokenStream<ComponentValue> token_stream { unparsed_size };
         auto media_condition = parse_media_condition(token_stream, MediaCondition::AllowOr::Yes);
-        if (media_condition && media_condition->evaluate(*m_context.window()) == MatchResult::True) {
+        auto context_window = m_context.window();
+        if (context_window && media_condition && media_condition->evaluate(*context_window) == MatchResult::True) {
             return size.value();
         } else {
             continue;
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/ParsingContext.cpp b/Userland/Libraries/LibWeb/CSS/Parser/ParsingContext.cpp
index 4fd1e036d7..0af33ebdc1 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/ParsingContext.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/ParsingContext.cpp
@@ -56,7 +56,7 @@ AK::URL ParsingContext::complete_url(StringView relative_url) const
 
 HTML::Window const* ParsingContext::window() const
 {
-    return m_document ? &m_document->window() : nullptr;
+    return m_document && m_document->default_view() ? &m_document->window() : nullptr;
 }
 
 }