From 29f11170be4a49da8fbe2e0c191a56f4fa11bdb3 Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Tue, 8 Jun 2021 19:22:52 +0300
Subject: [PATCH] Fix Back button in build.html on the main page.

---
 build.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build.html b/build.html
index 7c31d38..338e025 100644
--- a/build.html
+++ b/build.html
@@ -121,7 +121,7 @@ function onLoad(initial) {
 function onOsChanged(initial) {
   var os = document.getElementById('osSelect').value;
   if (os.includes('Choose ')) {
-    if (history.state != '') {
+    if (history.state !== '' && history.state !== null) {
       history.pushState('', '', 'build.html');
     }