From 07cff7038728545a5ce399c3b727b1d03c68813c Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Wed, 6 Jan 2021 18:19:03 +0900
Subject: [PATCH] Add specific messaging for when there's no background stack
 available

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

diff --git a/osu.Game/Screens/OsuScreen.cs b/osu.Game/Screens/OsuScreen.cs
index fb26739a44..e1a29946f4 100644
--- a/osu.Game/Screens/OsuScreen.cs
+++ b/osu.Game/Screens/OsuScreen.cs
@@ -125,6 +125,7 @@ namespace osu.Game.Screens
         private BackgroundScreen background;
 
         [Resolved(canBeNull: true)]
+        [CanBeNull]
         private BackgroundScreenStack backgroundStack { get; set; }
 
         [Resolved(canBeNull: true)]
@@ -152,8 +153,11 @@ namespace osu.Game.Screens
         /// <param name="action">The operation to perform.</param>
         public void ApplyToBackground(Action<BackgroundScreen> action)
         {
+            if (backgroundStack == null)
+                throw new InvalidOperationException("Attempted to apply to background without a background stack being available.");
+
             if (background == null)
-                throw new InvalidOperationException("Attempted to apply to background before screen is pushed");
+                throw new InvalidOperationException("Attempted to apply to background before screen is pushed.");
 
             background.ApplyToBackground(action);
         }