Merge pull request #24246 from bdach/fix-exit-dialog-crash

Fix potential crash in confirm exit dialog while attempting to exit game

osu.Game.Tests/Visual/Navigation/TestSceneScreenNavigation.cs

@@ -722,6 +722,30 @@ namespace osu.Game.Tests.Visual.Navigation
             AddUntilStep("Wait for game exit", () => Game.ScreenStack.CurrentScreen == null);
         }
 
+        [Test]
+        public void TestForceExitWithOperationInProgress()
+        {
+            AddStep("set hold delay to 0", () => Game.LocalConfig.SetValue(OsuSetting.UIHoldActivationDelay, 0.0));
+            AddUntilStep("wait for dialog overlay", () => Game.ChildrenOfType<DialogOverlay>().SingleOrDefault() != null);
+
+            AddStep("start ongoing operation", () =>
+            {
+                Game.Notifications.Post(new ProgressNotification
+                {
+                    Text = "Something is still running",
+                    Progress = 0.5f,
+                    State = ProgressNotificationState.Active,
+                });
+            });
+
+            AddStep("attempt exit", () =>
+            {
+                for (int i = 0; i < 2; ++i)
+                    Game.ScreenStack.CurrentScreen.Exit();
+            });
+            AddUntilStep("stopped at exit confirm", () => Game.ChildrenOfType<DialogOverlay>().Single().CurrentDialog is ConfirmExitDialog);
+        }
+
         [Test]
         public void TestExitGameFromSongSelect()
         {

osu.Game/Overlays/Dialog/PopupDialog.cs

@@ -229,7 +229,7 @@ namespace osu.Game.Overlays.Dialog
         {
             // Buttons are regularly added in BDL or LoadComplete, so let's schedule to ensure
             // they are ready to be pressed.
-            Schedule(() => Buttons.OfType<T>().First().TriggerClick());
+            Schedule(() => Buttons.OfType<T>().FirstOrDefault()?.TriggerClick());
         }
 
         protected override bool OnKeyDown(KeyDownEvent e)