From 4cf08d208766ac93ae36973f53ec5d4f639478ca Mon Sep 17 00:00:00 2001
From: Alexandre Ardhuin <alexandre.ardhuin@gmail.com>
Date: Thu, 15 Sep 2022 09:21:07 +0200
Subject: [PATCH] fix for upcoming use_build_context_synchronously

---
 lib/pages/demo.dart | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/pages/demo.dart b/lib/pages/demo.dart
index 6a3255cb6b..aff7dd4cce 100644
--- a/lib/pages/demo.dart
+++ b/lib/pages/demo.dart
@@ -194,7 +194,7 @@ class _GalleryDemoPageState extends State<GalleryDemoPage>
 
     if (await canLaunchUrlString(url)) {
       await launchUrlString(url);
-    } else {
+    } else if (mounted) {
       await showDialog<void>(
         context: context,
         builder: (context) {