From a9e1810158491fc8eaf83f939baabdffa1d0b459 Mon Sep 17 00:00:00 2001
From: easternkite <easternkite7@gmail.com>
Date: Thu, 22 May 2025 00:43:13 +0900
Subject: [PATCH] fix(navigation): prevent crash on double back press when
 backStack is empty

---
 .../developers/androidify/navigation/MainNavigation.kt    | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/com/android/developers/androidify/navigation/MainNavigation.kt b/app/src/main/java/com/android/developers/androidify/navigation/MainNavigation.kt
index 1bc07ed7..7d9e2e87 100644
--- a/app/src/main/java/com/android/developers/androidify/navigation/MainNavigation.kt
+++ b/app/src/main/java/com/android/developers/androidify/navigation/MainNavigation.kt
@@ -121,7 +121,9 @@ fun MainNavigation() {
                         backStack.add(Camera)
                     },
                     onBackPressed = {
-                        backStack.removeLastOrNull()
+                        if (backStack.isNotEmpty() && backStack.last() is Create) {
+                            backStack.removeLastOrNull()
+                        }
                     },
                     onAboutPressed = {
                         backStack.add(About)
@@ -131,7 +133,9 @@ fun MainNavigation() {
             entry<About> {
                 AboutScreen(
                     onBackPressed = {
-                        backStack.removeLastOrNull()
+                        if (backStack.isNotEmpty() && backStack.last() is About) {
+                            backStack.removeLastOrNull()
+                        }
                     },
                 )
             }