From 3ad29f6eb715b6aea255339daa6f97c35ac79edc Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Tue, 11 Dec 2018 16:22:27 +0400
Subject: [PATCH] Fix crash in media preview.

---
 Telegram/SourceFiles/mainwindow.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Telegram/SourceFiles/mainwindow.cpp b/Telegram/SourceFiles/mainwindow.cpp
index 3d241eab5..7c3006d26 100644
--- a/Telegram/SourceFiles/mainwindow.cpp
+++ b/Telegram/SourceFiles/mainwindow.cpp
@@ -81,6 +81,9 @@ MainWindow::MainWindow() {
 
 	subscribe(Messenger::Instance().authSessionChanged(), [this] {
 		updateGlobalMenu();
+		if (!AuthSession::Exists()) {
+			_mediaPreview.destroy();
+		}
 	});
 	subscribe(Window::Theme::Background(), [this](const Window::Theme::BackgroundUpdate &data) {
 		themeUpdated(data);