Exiting a multiplayer game while a map is loading causes a visual glitch

[baerchen201]

Type

Other

Bug description

When you try to leave a multiplayer match, a confirm dialog shows up. This dialog stays open, even when the host starts the game.
If you confirm the exit while the map is loading, the screen will get messed up and not show anything.
The game recovers upon returning to the main menu.

Screenshots or videos

https://youtu.be/vUMn_OfmbKM

Version

2024.906.2

Logs

l.zip
Relevant logs: runtime, line 206

[bdach]

Line 206 is the server more or less correctly handling the weird state you managed to enter (although it is debatable whether the error should show). I'm more concerned with line 212:

2024-09-13 00:10:56 [error]: System.NullReferenceException: Object reference not set to an instance of an object.
2024-09-13 00:10:56 [error]: at osu.Game.Screens.OnlinePlay.Lounge.LoungeSubScreen.OnResuming(ScreenTransitionEvent e)
2024-09-13 00:10:56 [error]: at osu.Game.Screens.OnlinePlay.Multiplayer.MultiplayerLoungeSubScreen.OnResuming(ScreenTransitionEvent e)
2024-09-13 00:10:56 [error]: at osu.Game.Screens.OnlinePlay.OnlinePlayScreen.OnResuming(ScreenTransitionEvent e)
2024-09-13 00:10:56 [error]: at osu.Game.Screens.OnlinePlay.Multiplayer.Multiplayer.OnResuming(ScreenTransitionEvent e)
2024-09-13 00:10:56 [error]: at osu.Framework.Screens.ScreenStack.resumeFrom(IScreen source)
2024-09-13 00:10:56 [error]: at osu.Framework.Screens.ScreenStack.exitFrom(IScreen source, Boolean shouldFireExitEvent, Boolean shouldFireResumeEvent, IScreen destination)
2024-09-13 00:10:56 [error]: at osu.Framework.Screens.ScreenStack.Exit(IScreen source)
2024-09-13 00:10:56 [error]: at osu.Framework.Screens.ScreenExtensions.Exit(IScreen screen)
2024-09-13 00:10:56 [error]: at osu.Game.Screens.OnlinePlay.Multiplayer.MultiplayerPlayerLoader.<failAndBail>b__11_0()
2024-09-13 00:10:56 [error]: at osu.Framework.Threading.ScheduledDelegate.RunTaskInternal()
2024-09-13 00:10:56 [error]: at osu.Framework.Threading.Scheduler.Update()
2024-09-13 00:10:56 [error]: at osu.Framework.Graphics.Drawable.UpdateSubTree()

[ppy-sentryintegration]

Sentry issue: OSU-Q1C