From 9bec42bc7ee8e59a1e9faebdc9388350259a7212 Mon Sep 17 00:00:00 2001
From: smoogipoo <smoogipoo@smgi.me>
Date: Thu, 30 Apr 2020 20:03:46 +0900
Subject: [PATCH] Fix mania crashing on undo/redo

---
 osu.Game/Screens/Edit/LegacyEditorBeatmapPatcher.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/osu.Game/Screens/Edit/LegacyEditorBeatmapPatcher.cs b/osu.Game/Screens/Edit/LegacyEditorBeatmapPatcher.cs
index 17eba87076..45a0a5c485 100644
--- a/osu.Game/Screens/Edit/LegacyEditorBeatmapPatcher.cs
+++ b/osu.Game/Screens/Edit/LegacyEditorBeatmapPatcher.cs
@@ -84,7 +84,11 @@ namespace osu.Game.Screens.Edit
         {
             using (var stream = new MemoryStream(state))
             using (var reader = new LineBufferedReader(stream, true))
-                return new PassThroughWorkingBeatmap(Decoder.GetDecoder<Beatmap>(reader).Decode(reader)).GetPlayableBeatmap(editorBeatmap.BeatmapInfo.Ruleset);
+            {
+                var decoded = Decoder.GetDecoder<Beatmap>(reader).Decode(reader);
+                decoded.BeatmapInfo.Ruleset = editorBeatmap.BeatmapInfo.Ruleset;
+                return new PassThroughWorkingBeatmap(decoded).GetPlayableBeatmap(editorBeatmap.BeatmapInfo.Ruleset);
+            }
         }
 
         private class PassThroughWorkingBeatmap : WorkingBeatmap