From 16e4e8d032dc44dc97f606922879114e4299ff43 Mon Sep 17 00:00:00 2001
From: smoogipoo <smoogipoo@smgi.me>
Date: Thu, 12 Nov 2020 14:54:33 +0900
Subject: [PATCH] Fix possible nullref

---
 osu.Game/Rulesets/UI/HitObjectContainer.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/osu.Game/Rulesets/UI/HitObjectContainer.cs b/osu.Game/Rulesets/UI/HitObjectContainer.cs
index d55288b978..7315ce61e7 100644
--- a/osu.Game/Rulesets/UI/HitObjectContainer.cs
+++ b/osu.Game/Rulesets/UI/HitObjectContainer.cs
@@ -7,6 +7,7 @@ using System.Diagnostics;
 using System.Linq;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
+using osu.Framework.Extensions.TypeExtensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Performance;
@@ -71,6 +72,9 @@ namespace osu.Game.Rulesets.UI
             Debug.Assert(!drawableMap.ContainsKey(entry));
 
             var drawable = drawableRuleset.GetPooledDrawableRepresentation(entry.HitObject);
+            if (drawable == null)
+                throw new InvalidOperationException($"A drawable representation could not be retrieved for hitobject type: {entry.HitObject.GetType().ReadableName()}.");
+
             drawable.OnNewResult += onNewResult;
             drawable.OnRevertResult += onRevertResult;