From d74aa52e69b20c7cfc8269b5b613651341359699 Mon Sep 17 00:00:00 2001
From: Shane Woolcock <samahnub@gmail.com>
Date: Tue, 8 Jan 2019 18:35:23 +1030
Subject: [PATCH] Revert to old behaviour if no TrackManager available

---
 osu.Game/Beatmaps/BeatmapManager_WorkingBeatmap.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/osu.Game/Beatmaps/BeatmapManager_WorkingBeatmap.cs b/osu.Game/Beatmaps/BeatmapManager_WorkingBeatmap.cs
index 74e9825dc3..10dffb6125 100644
--- a/osu.Game/Beatmaps/BeatmapManager_WorkingBeatmap.cs
+++ b/osu.Game/Beatmaps/BeatmapManager_WorkingBeatmap.cs
@@ -28,7 +28,7 @@ namespace osu.Game.Beatmaps
             {
                 this.store = store;
                 this.audioManager = audioManager;
-                this.trackManager = audioManager.Track;
+                trackManager = audioManager?.Track;
             }
 
             protected override IBeatmap GetBeatmap()
@@ -70,7 +70,7 @@ namespace osu.Game.Beatmaps
                 try
                 {
                     var trackData = store.GetStream(getPathForFile(Metadata.AudioFile));
-                    return trackData == null ? null : trackManager.CreateTrack(trackData);
+                    return trackData == null ? null : trackManager?.CreateTrack(trackData) ?? new TrackBass(trackData);
                 }
                 catch
                 {
@@ -91,7 +91,7 @@ namespace osu.Game.Beatmaps
                 try
                 {
                     var trackData = store.GetStream(getPathForFile(Metadata.AudioFile));
-                    return trackData == null ? null : trackManager.CreateWaveform(trackData);
+                    return trackData == null ? null : trackManager?.CreateWaveform(trackData) ?? new Waveform(trackData);
                 }
                 catch
                 {