diff --git a/Telegram/SourceFiles/window/section_widget.cpp b/Telegram/SourceFiles/window/section_widget.cpp
index 18f3f7d059..ae24ad4d3e 100644
--- a/Telegram/SourceFiles/window/section_widget.cpp
+++ b/Telegram/SourceFiles/window/section_widget.cpp
@@ -201,10 +201,12 @@ rpl::producer<const Data::WallPaper*> WallPaperResolved(
 		return result;
 	}
 	themes->refreshChatThemes();
-	return themes->chatThemesUpdated(
+	return rpl::single<const Data::WallPaper*>(
+		nullptr
+	) | rpl::then(themes->chatThemesUpdated(
 	) | rpl::take(1) | rpl::map([=] {
 		return fromThemes(true);
-	}) | rpl::flatten_latest();
+	}) | rpl::flatten_latest());
 }
 
 AbstractSectionWidget::AbstractSectionWidget(
diff --git a/Telegram/SourceFiles/window/window_session_controller.h b/Telegram/SourceFiles/window/window_session_controller.h
index 241567b5ed..cf4033ce45 100644
--- a/Telegram/SourceFiles/window/window_session_controller.h
+++ b/Telegram/SourceFiles/window/window_session_controller.h
@@ -700,7 +700,7 @@ private:
 
 	rpl::event_stream<> _filtersMenuChanged;
 
-	std::shared_ptr<Ui::ChatTheme> _defaultChatTheme;
+	const std::shared_ptr<Ui::ChatTheme> _defaultChatTheme;
 	base::flat_map<CachedThemeKey, CachedTheme> _customChatThemes;
 	rpl::event_stream<std::shared_ptr<Ui::ChatTheme>> _cachedThemesStream;
 	const std::unique_ptr<Ui::ChatStyle> _chatStyle;