From a3c3052d0fae8223b73b4ee0abca2b6702da92a2 Mon Sep 17 00:00:00 2001
From: syuilo <4439005+syuilo@users.noreply.github.com>
Date: Thu, 4 Dec 2025 15:19:15 +0900
Subject: [PATCH] =?UTF-8?q?fix(frontend):=20stacking=20router=20view?=
 =?UTF-8?q?=E3=81=A7=E9=80=A3=E7=B6=9A=E3=81=97=E3=81=A6=E6=88=BB=E3=82=8B?=
 =?UTF-8?q?=E6=93=8D=E4=BD=9C=E3=82=92=E8=A1=8C=E3=81=86=E3=81=A8=E4=BD=95?=
 =?UTF-8?q?=E3=82=82=E8=A1=A8=E7=A4=BA=E3=81=95=E3=82=8C=E3=81=AA=E3=81=8F?=
 =?UTF-8?q?=E3=81=AA=E3=82=8B=E5=95=8F=E9=A1=8C=E3=82=92=E4=BF=AE=E6=AD=A3?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 CHANGELOG.md                                                  | 2 +-
 .../frontend/src/components/global/StackingRouterView.vue     | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f4f7933824..a30bf8c441 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@
 -
 
 ### Client
--
+- Fix: stacking router viewで連続して戻る操作を行うと何も表示されなくなる問題を修正
 
 ### Server
 - Enhance: メモリ使用量を削減しました
diff --git a/packages/frontend/src/components/global/StackingRouterView.vue b/packages/frontend/src/components/global/StackingRouterView.vue
index 4c56767608..e9c24bfcb4 100644
--- a/packages/frontend/src/components/global/StackingRouterView.vue
+++ b/packages/frontend/src/components/global/StackingRouterView.vue
@@ -74,7 +74,9 @@ function mount() {
 }
 
 function back() {
-	const prev = tabs.value[tabs.value.length - 2];
+	const prev = tabs.value.at(tabs.value.length - 2);
+	if (prev == null) return; // transitionの関係でprevが無い状態でbackが呼ばれることがある
+
 	tabs.value = [...tabs.value.slice(0, tabs.value.length - 1)];
 	router?.replaceByPath(prev.fullPath);
 }