From 12f52316cd2f198c0d649f41b46ef2975cfbb16d Mon Sep 17 00:00:00 2001
From: smoogipoo <smoogipoo@smgi.me>
Date: Tue, 2 Feb 2021 18:37:11 +0900
Subject: [PATCH] Prevent multiple enumeration

---
 osu.Game/Utils/ModUtils.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/osu.Game/Utils/ModUtils.cs b/osu.Game/Utils/ModUtils.cs
index 41f7b1b45c..9336add465 100644
--- a/osu.Game/Utils/ModUtils.cs
+++ b/osu.Game/Utils/ModUtils.cs
@@ -47,7 +47,7 @@ namespace osu.Game.Utils
         /// <returns>Whether all <see cref="Mod"/>s in the combination are compatible with each-other.</returns>
         public static bool CheckCompatibleSet(IEnumerable<Mod> combination, out List<Mod>? invalidMods)
         {
-            combination = FlattenMods(combination);
+            combination = FlattenMods(combination).ToArray();
             invalidMods = null;
 
             foreach (var mod in combination)