From 09f9f86b062e9420767480164602e041e97e9dca Mon Sep 17 00:00:00 2001
From: n4b3l <dendende@hotmail.com>
Date: Mon, 19 Dec 2016 14:03:10 +0100
Subject: [PATCH 1/2] check if dimLevel is null on exit

---
 osu.Game/Screens/Play/Player.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/osu.Game/Screens/Play/Player.cs b/osu.Game/Screens/Play/Player.cs
index 7b6f260c56..236a84ccfd 100644
--- a/osu.Game/Screens/Play/Player.cs
+++ b/osu.Game/Screens/Play/Player.cs
@@ -158,7 +158,8 @@ namespace osu.Game.Screens.Play
 
         protected override bool OnExiting(GameMode next)
         {
-            dimLevel.ValueChanged -= dimChanged;
+            if(dimLevel != null)
+                dimLevel.ValueChanged -= dimChanged;
             Background?.FadeTo(1f, 200);
             return base.OnExiting(next);
         }

From aebe87fefc9fec87d350907d0dd040cdfa4834e3 Mon Sep 17 00:00:00 2001
From: n4b3l <dendende@hotmail.com>
Date: Mon, 19 Dec 2016 16:09:29 +0100
Subject: [PATCH 2/2] better implementation

---
 osu.Game/Screens/Play/Player.cs | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/osu.Game/Screens/Play/Player.cs b/osu.Game/Screens/Play/Player.cs
index 236a84ccfd..ca4245504b 100644
--- a/osu.Game/Screens/Play/Player.cs
+++ b/osu.Game/Screens/Play/Player.cs
@@ -50,6 +50,7 @@ namespace osu.Game.Screens.Play
         [BackgroundDependencyLoader]
         private void load(AudioManager audio, BeatmapDatabase beatmaps, OsuGameBase game)
         {
+            dimLevel = game.Config.GetBindable<int>(OsuConfig.DimLevel);
             try
             {
                 if (Beatmap == null)
@@ -114,7 +115,6 @@ namespace osu.Game.Screens.Play
                 },
                 scoreOverlay,
             };
-            dimLevel = game.Config.GetBindable<int>(OsuConfig.DimLevel);
         }
 
         protected override void LoadComplete()
@@ -158,8 +158,7 @@ namespace osu.Game.Screens.Play
 
         protected override bool OnExiting(GameMode next)
         {
-            if(dimLevel != null)
-                dimLevel.ValueChanged -= dimChanged;
+            dimLevel.ValueChanged -= dimChanged;
             Background?.FadeTo(1f, 200);
             return base.OnExiting(next);
         }