From 1c13fa6c6199ed5a51d985f140b209fb804ddd4a Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Fri, 24 Apr 2020 10:27:32 +0900
Subject: [PATCH] Fix editor crashing when entering with no beatmap selected

---
 .../Edit/Compose/Components/Timeline/Timeline.cs      | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/osu.Game/Screens/Edit/Compose/Components/Timeline/Timeline.cs b/osu.Game/Screens/Edit/Compose/Components/Timeline/Timeline.cs
index 1cb4f737c1..8e6b3d5424 100644
--- a/osu.Game/Screens/Edit/Compose/Components/Timeline/Timeline.cs
+++ b/osu.Game/Screens/Edit/Compose/Components/Timeline/Timeline.cs
@@ -60,9 +60,12 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
                 waveform.Waveform = b.NewValue.Waveform;
                 track = b.NewValue.Track;
 
-                MaxZoom = getZoomLevelForVisibleMilliseconds(500);
-                MinZoom = getZoomLevelForVisibleMilliseconds(10000);
-                Zoom = getZoomLevelForVisibleMilliseconds(2000);
+                if (track.Length > 0)
+                {
+                    MaxZoom = getZoomLevelForVisibleMilliseconds(500);
+                    MinZoom = getZoomLevelForVisibleMilliseconds(10000);
+                    Zoom = getZoomLevelForVisibleMilliseconds(2000);
+                }
             }, true);
         }
 
@@ -135,7 +138,7 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
 
         private void scrollToTrackTime()
         {
-            if (!track.IsLoaded)
+            if (!track.IsLoaded || track.Length == 0)
                 return;
 
             ScrollTo((float)(adjustableClock.CurrentTime / track.Length) * Content.DrawWidth, false);