From b121d95400727bedb1c6d929d8ed5a741e904399 Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Tue, 10 Aug 2021 17:37:24 +0900
Subject: [PATCH] Avoid potential null reference exception in
 `OnlinePlayBeatmapAvailabilityTracker`

---
 osu.Game/Online/Rooms/OnlinePlayBeatmapAvailabilityTracker.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/osu.Game/Online/Rooms/OnlinePlayBeatmapAvailabilityTracker.cs b/osu.Game/Online/Rooms/OnlinePlayBeatmapAvailabilityTracker.cs
index 72ea84d4a8..86879ba245 100644
--- a/osu.Game/Online/Rooms/OnlinePlayBeatmapAvailabilityTracker.cs
+++ b/osu.Game/Online/Rooms/OnlinePlayBeatmapAvailabilityTracker.cs
@@ -59,8 +59,8 @@ namespace osu.Game.Online.Rooms
 
         protected override bool VerifyDatabasedModel(BeatmapSetInfo databasedSet)
         {
-            int? beatmapId = SelectedItem.Value.Beatmap.Value.OnlineBeatmapID;
-            string checksum = SelectedItem.Value.Beatmap.Value.MD5Hash;
+            int? beatmapId = SelectedItem.Value?.Beatmap.Value.OnlineBeatmapID;
+            string checksum = SelectedItem.Value?.Beatmap.Value.MD5Hash;
 
             var matchingBeatmap = databasedSet.Beatmaps.FirstOrDefault(b => b.OnlineBeatmapID == beatmapId && b.MD5Hash == checksum);