diff --git a/data/web/webappcontent.telegram.org/demo.html b/data/web/webappcontent.telegram.org/demo.html
index e902b6a70d..c4de46e214 100644
--- a/data/web/webappcontent.telegram.org/demo.html
+++ b/data/web/webappcontent.telegram.org/demo.html
@@ -105,7 +105,7 @@
   <div class="viewport-stable_border"></div>
     <script src="/js/jquery.min.js"></script>
     <script src="https://tg.dev/js/bootstrap.min.js"></script>
-    <script src="/js/webappdemo.js?8"></script>
+    <script src="/js/webappdemo.js?9"></script>
     <script>
 Telegram.WebApp.onEvent('themeChanged', function() {
   $('#theme_data').html(JSON.stringify(Telegram.WebApp.themeParams, null, 2));
diff --git a/data/web/webappcontent.telegram.org/js/webappdemo.js b/data/web/webappcontent.telegram.org/js/webappdemo.js
index 8521203bbf..9c6c8c0286 100644
--- a/data/web/webappcontent.telegram.org/js/webappdemo.js
+++ b/data/web/webappcontent.telegram.org/js/webappdemo.js
@@ -193,7 +193,7 @@ var DemoApp = {
       text: links_only ? 'with any link' : 'for test purposes'
     }, function(text) {
       if (links_only) {
-        var lower_text = text.toSting().toLowerCase();
+        var lower_text = text.toString().toLowerCase();
         if (lower_text.substr(0, 7) == 'http://' ||
             lower_text.substr(0, 8) == 'https://') {
           setTimeout(function() {