From 1d023dcedbb64fcac9d4956c73de22407e51b035 Mon Sep 17 00:00:00 2001
From: ekrctb <ekrctb@gmail.com>
Date: Mon, 26 Apr 2021 19:53:38 +0900
Subject: [PATCH] Fix mania editor null reference

---
 .../Edit/Blueprints/ManiaSelectionBlueprint.cs                 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/osu.Game.Rulesets.Mania/Edit/Blueprints/ManiaSelectionBlueprint.cs b/osu.Game.Rulesets.Mania/Edit/Blueprints/ManiaSelectionBlueprint.cs
index 384f49d9b2..8f8f45c0dd 100644
--- a/osu.Game.Rulesets.Mania/Edit/Blueprints/ManiaSelectionBlueprint.cs
+++ b/osu.Game.Rulesets.Mania/Edit/Blueprints/ManiaSelectionBlueprint.cs
@@ -18,6 +18,9 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
         [Resolved]
         private IScrollingInfo scrollingInfo { get; set; }
 
+        // Overriding the base because this method is called right after `Column` is changed and `DrawableObject` is not yet loaded and Parent is not set.
+        public override Vector2 GetInstantDelta(Vector2 screenSpacePosition) => Parent.ToLocalSpace(screenSpacePosition) - Position;
+
         protected ManiaSelectionBlueprint(DrawableHitObject drawableObject)
             : base(drawableObject)
         {