diff --git a/osu.Game/Collections/CollectionManager.cs b/osu.Game/Collections/CollectionManager.cs
index d230e649f7..c4f991094c 100644
--- a/osu.Game/Collections/CollectionManager.cs
+++ b/osu.Game/Collections/CollectionManager.cs
@@ -209,7 +209,7 @@ namespace osu.Game.Collections
 
                             string checksum = sr.ReadString();
 
-                            var beatmap = beatmaps.QueryBeatmap(b => b.MD5Hash == checksum)?.Detach();
+                            var beatmap = beatmaps.QueryBeatmap(b => b.MD5Hash == checksum);
                             if (beatmap != null)
                                 collection.Beatmaps.Add(beatmap);
                         }