diff --git a/osu.Game.Rulesets.Osu/Objects/Slider.cs b/osu.Game.Rulesets.Osu/Objects/Slider.cs
index c62659d67a..3cb9b96090 100644
--- a/osu.Game.Rulesets.Osu/Objects/Slider.cs
+++ b/osu.Game.Rulesets.Osu/Objects/Slider.cs
@@ -49,13 +49,9 @@ namespace osu.Game.Rulesets.Osu.Objects
             set
             {
                 path.ControlPoints.Clear();
-                path.ExpectedDistance.Value = null;
+                path.ControlPoints.AddRange(value.ControlPoints.Select(c => new PathControlPoint(c.Position, c.Type)));
 
-                if (value != null)
-                {
-                    path.ControlPoints.AddRange(value.ControlPoints.Select(c => new PathControlPoint(c.Position, c.Type)));
-                    path.ExpectedDistance.Value = value.ExpectedDistance.Value;
-                }
+                path.ExpectedDistance.Value = value.ExpectedDistance.Value;
             }
         }
 
diff --git a/osu.Game/Online/API/APIRequest.cs b/osu.Game/Online/API/APIRequest.cs
index cd6e8df754..6b6b222043 100644
--- a/osu.Game/Online/API/APIRequest.cs
+++ b/osu.Game/Online/API/APIRequest.cs
@@ -7,6 +7,7 @@ using System;
 using System.Globalization;
 using JetBrains.Annotations;
 using Newtonsoft.Json;
+using osu.Framework.Extensions.TypeExtensions;
 using osu.Framework.IO.Network;
 using osu.Framework.Logging;
 using osu.Game.Extensions;
@@ -46,7 +47,7 @@ namespace osu.Game.Online.API
             if (WebRequest != null)
             {
                 Response = ((OsuJsonWebRequest<T>)WebRequest).ResponseObject;
-                Logger.Log($"{GetType()} finished with response size of {WebRequest.ResponseStream.Length:#,0} bytes", LoggingTarget.Network);
+                Logger.Log($"{GetType().ReadableName()} finished with response size of {WebRequest.ResponseStream.Length:#,0} bytes", LoggingTarget.Network);
             }
         }
 
diff --git a/osu.Game/Rulesets/Edit/SelectionBlueprint.cs b/osu.Game/Rulesets/Edit/SelectionBlueprint.cs
index 158c3c102c..3ed7558bcb 100644
--- a/osu.Game/Rulesets/Edit/SelectionBlueprint.cs
+++ b/osu.Game/Rulesets/Edit/SelectionBlueprint.cs
@@ -5,6 +5,7 @@
 
 using System;
 using System.Linq;
+using JetBrains.Annotations;
 using osu.Framework;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
@@ -51,6 +52,7 @@ namespace osu.Game.Rulesets.Edit
 
         private SelectionState state;
 
+        [CanBeNull]
         public event Action<SelectionState> StateChanged;
 
         public SelectionState State
diff --git a/osu.Game/Screens/Backgrounds/BackgroundScreenBeatmap.cs b/osu.Game/Screens/Backgrounds/BackgroundScreenBeatmap.cs
index 1506b884b4..85ea881006 100644
--- a/osu.Game/Screens/Backgrounds/BackgroundScreenBeatmap.cs
+++ b/osu.Game/Screens/Backgrounds/BackgroundScreenBeatmap.cs
@@ -166,6 +166,8 @@ namespace osu.Game.Screens.Backgrounds
 
             public override void Add(Drawable drawable)
             {
+                ArgumentNullException.ThrowIfNull(drawable);
+
                 if (drawable is Background)
                     throw new InvalidOperationException($"Use {nameof(Background)} to set a background.");
 
diff --git a/osu.Game/Screens/Play/SquareGraph.cs b/osu.Game/Screens/Play/SquareGraph.cs
index b53e86a41b..0c7b485755 100644
--- a/osu.Game/Screens/Play/SquareGraph.cs
+++ b/osu.Game/Screens/Play/SquareGraph.cs
@@ -7,6 +7,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
+using JetBrains.Annotations;
 using osu.Framework;
 using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Graphics;
@@ -190,6 +191,7 @@ namespace osu.Game.Screens.Play
             private const float padding = 2;
             public const float WIDTH = cube_size + padding;
 
+            [CanBeNull]
             public event Action<ColumnState> StateChanged;
 
             private readonly List<Box> drawableRows = new List<Box>();
diff --git a/osu.Game/Screens/Play/SubmittingPlayer.cs b/osu.Game/Screens/Play/SubmittingPlayer.cs
index 5fa6508a31..a75546f835 100644
--- a/osu.Game/Screens/Play/SubmittingPlayer.cs
+++ b/osu.Game/Screens/Play/SubmittingPlayer.cs
@@ -188,7 +188,10 @@ namespace osu.Game.Screens.Play
         {
             // token may be null if the request failed but gameplay was still allowed (see HandleTokenRetrievalFailure).
             if (token == null)
+            {
+                Logger.Log("No token, skipping score submission");
                 return Task.CompletedTask;
+            }
 
             if (scoreSubmissionSource != null)
                 return scoreSubmissionSource.Task;
@@ -197,6 +200,8 @@ namespace osu.Game.Screens.Play
             if (!score.ScoreInfo.Statistics.Any(s => s.Key.IsHit() && s.Value > 0))
                 return Task.CompletedTask;
 
+            Logger.Log($"Beginning score submission (token:{token.Value})...");
+
             scoreSubmissionSource = new TaskCompletionSource<bool>();
             var request = CreateSubmissionRequest(score, token.Value);
 
@@ -206,11 +211,12 @@ namespace osu.Game.Screens.Play
                 score.ScoreInfo.Position = s.Position;
 
                 scoreSubmissionSource.SetResult(true);
+                Logger.Log($"Score submission completed! (token:{token.Value} id:{s.ID})");
             };
 
             request.Failure += e =>
             {
-                Logger.Error(e, $"Failed to submit score ({e.Message})");
+                Logger.Error(e, $"Failed to submit score (token:{token.Value}): {e.Message}");
                 scoreSubmissionSource.SetResult(false);
             };