From b1f653899c59cb8ef488e0e2ae09d44102f221db Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Wed, 28 Aug 2024 16:30:09 +0900
Subject: [PATCH] Fix enumeration over modified collection

---
 osu.Game/Screens/Select/BeatmapCarousel.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/osu.Game/Screens/Select/BeatmapCarousel.cs b/osu.Game/Screens/Select/BeatmapCarousel.cs
index 05e567b693..305deb4ba9 100644
--- a/osu.Game/Screens/Select/BeatmapCarousel.cs
+++ b/osu.Game/Screens/Select/BeatmapCarousel.cs
@@ -137,6 +137,10 @@ namespace osu.Game.Screens.Select
 
         private void loadBeatmapSets(IEnumerable<BeatmapSetInfo> beatmapSets)
         {
+            // Ensure no changes are made to the list while we are initialising items.
+            // We'll catch up on changes via subscriptions anyway.
+            beatmapSets = beatmapSets.ToArray();
+
             if (selectedBeatmapSet != null && !beatmapSets.Contains(selectedBeatmapSet.BeatmapSet))
                 selectedBeatmapSet = null;