diff --git a/osu.Game/Database/LegacyImportManager.cs b/osu.Game/Database/LegacyImportManager.cs
index 96f4aaf67c..797df49264 100644
--- a/osu.Game/Database/LegacyImportManager.cs
+++ b/osu.Game/Database/LegacyImportManager.cs
@@ -1,8 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Threading;
@@ -27,27 +25,30 @@ namespace osu.Game.Database
     public class LegacyImportManager : Component
     {
         [Resolved]
-        private SkinManager skins { get; set; }
+        private SkinManager skins { get; set; } = null!;
 
         [Resolved]
-        private BeatmapManager beatmaps { get; set; }
+        private BeatmapManager beatmaps { get; set; } = null!;
 
         [Resolved]
-        private ScoreManager scores { get; set; }
-
-        [Resolved(canBeNull: true)]
-        private OsuGame game { get; set; }
+        private ScoreManager scores { get; set; } = null!;
 
         [Resolved]
-        private IDialogOverlay dialogOverlay { get; set; }
+        private OsuGame? game { get; set; }
 
         [Resolved]
-        private RealmAccess realmAccess { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; } = null!;
 
-        [Resolved(canBeNull: true)]
-        private DesktopGameHost desktopGameHost { get; set; }
+        [Resolved]
+        private RealmAccess realmAccess { get; set; } = null!;
 
-        private StableStorage cachedStorage;
+        [Resolved]
+        private DesktopGameHost? desktopGameHost { get; set; }
+
+        [Resolved]
+        private INotificationOverlay? notifications { get; set; }
+
+        private StableStorage? cachedStorage;
 
         public bool SupportsImportFromStable => RuntimeInfo.IsDesktop;
 
@@ -98,6 +99,9 @@ namespace osu.Game.Database
                 stableStorage = GetCurrentStableStorage();
             }
 
+            if (stableStorage == null)
+                return;
+
             var importTasks = new List<Task>();
 
             Task beatmapImportTask = Task.CompletedTask;
@@ -108,7 +112,14 @@ namespace osu.Game.Database
                 importTasks.Add(new LegacySkinImporter(skins).ImportFromStableAsync(stableStorage));
 
             if (content.HasFlagFast(StableContent.Collections))
-                importTasks.Add(beatmapImportTask.ContinueWith(_ => new LegacyCollectionImporter(realmAccess).ImportFromStorage(stableStorage), TaskContinuationOptions.OnlyOnRanToCompletion));
+            {
+                importTasks.Add(beatmapImportTask.ContinueWith(_ => new LegacyCollectionImporter(realmAccess)
+                {
+                    // Other legacy importers import via model managers which handle the posting of notifications.
+                    // Collections are an exception.
+                    PostNotification = n => notifications?.Post(n)
+                }.ImportFromStorage(stableStorage), TaskContinuationOptions.OnlyOnRanToCompletion));
+            }
 
             if (content.HasFlagFast(StableContent.Scores))
                 importTasks.Add(beatmapImportTask.ContinueWith(_ => new LegacyScoreImporter(scores).ImportFromStableAsync(stableStorage), TaskContinuationOptions.OnlyOnRanToCompletion));
@@ -116,7 +127,7 @@ namespace osu.Game.Database
             await Task.WhenAll(importTasks.ToArray()).ConfigureAwait(false);
         }
 
-        public StableStorage GetCurrentStableStorage()
+        public StableStorage? GetCurrentStableStorage()
         {
             if (cachedStorage != null)
                 return cachedStorage;