From 6400ba1df5c4a99384251783ff7450cf277f3727 Mon Sep 17 00:00:00 2001
From: Aldy J <aldycool@users.noreply.github.com>
Date: Sun, 26 Sep 2021 22:19:11 +0700
Subject: [PATCH] Avoid runtime error when placed inside TabBarView (#410)

---
 lib/src/widgets/toolbar/arrow_indicated_button_list.dart | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/src/widgets/toolbar/arrow_indicated_button_list.dart b/lib/src/widgets/toolbar/arrow_indicated_button_list.dart
index b17157d4..b3858e5d 100644
--- a/lib/src/widgets/toolbar/arrow_indicated_button_list.dart
+++ b/lib/src/widgets/toolbar/arrow_indicated_button_list.dart
@@ -60,6 +60,8 @@ class _ArrowIndicatedButtonListState extends State<ArrowIndicatedButtonList>
   }
 
   void _handleScroll() {
+    if (!mounted) return;
+
     setState(() {
       _showLeftArrow =
           _controller.position.minScrollExtent != _controller.position.pixels;