From 2d9b0acabe7fd4826e7d791d88c89a348afc0601 Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Sat, 12 Sep 2020 15:33:13 +0900
Subject: [PATCH] Fix empty selection via keyboard shortcuts crashing

---
 osu.Game/Screens/Edit/Editor.cs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/osu.Game/Screens/Edit/Editor.cs b/osu.Game/Screens/Edit/Editor.cs
index d6b2b4ba3a..19bac2a778 100644
--- a/osu.Game/Screens/Edit/Editor.cs
+++ b/osu.Game/Screens/Edit/Editor.cs
@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using osu.Framework;
 using osu.Framework.Allocation;
@@ -439,6 +440,9 @@ namespace osu.Game.Screens.Edit
 
         protected void Copy()
         {
+            if (editorBeatmap.SelectedHitObjects.Count == 0)
+                return;
+
             clipboard.Value = new ClipboardContent(editorBeatmap).Serialize();
         }
 
@@ -448,6 +452,9 @@ namespace osu.Game.Screens.Edit
                 return;
 
             var objects = clipboard.Value.Deserialize<ClipboardContent>().HitObjects;
+
+            Debug.Assert(objects.Any());
+
             double timeOffset = clock.CurrentTime - objects.First().StartTime;
 
             foreach (var h in objects)