diff --git a/osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapLeaderboard.cs b/osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapLeaderboard.cs
index 3eff75b020..1198488bda 100644
--- a/osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapLeaderboard.cs
+++ b/osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapLeaderboard.cs
@@ -59,6 +59,33 @@ namespace osu.Game.Tests.Visual.SongSelect
             AddStep(@"None selected", () => leaderboard.SetRetrievalState(PlaceholderState.NoneSelected));
             foreach (BeatmapSetOnlineStatus status in Enum.GetValues(typeof(BeatmapSetOnlineStatus)))
                 AddStep($"{status} beatmap", () => showBeatmapWithStatus(status));
+            AddStep("null personal best position", showPersonalBestWithNullPosition);
+        }
+
+        private void showPersonalBestWithNullPosition()
+        {
+            leaderboard.TopScore = new APILegacyUserTopScoreInfo
+            {
+                Position = null,
+                Score = new APILegacyScoreInfo
+                {
+                    Rank = ScoreRank.XH,
+                    Accuracy = 1,
+                    MaxCombo = 244,
+                    TotalScore = 1707827,
+                    Mods = new[] { new OsuModHidden().Acronym, new OsuModHardRock().Acronym, },
+                    User = new User
+                    {
+                        Id = 6602580,
+                        Username = @"waaiiru",
+                        Country = new Country
+                        {
+                            FullName = @"Spain",
+                            FlagName = @"ES",
+                        },
+                    },
+                }
+            };
         }
 
         private void showPersonalBest()
diff --git a/osu.Game/Online/API/Requests/Responses/APILegacyScores.cs b/osu.Game/Online/API/Requests/Responses/APILegacyScores.cs
index 318fcb00de..75be9171b0 100644
--- a/osu.Game/Online/API/Requests/Responses/APILegacyScores.cs
+++ b/osu.Game/Online/API/Requests/Responses/APILegacyScores.cs
@@ -18,7 +18,7 @@ namespace osu.Game.Online.API.Requests.Responses
     public class APILegacyUserTopScoreInfo
     {
         [JsonProperty(@"position")]
-        public int Position;
+        public int? Position;
 
         [JsonProperty(@"score")]
         public APILegacyScoreInfo Score;
diff --git a/osu.Game/Online/Leaderboards/LeaderboardScore.cs b/osu.Game/Online/Leaderboards/LeaderboardScore.cs
index 1f52a4481b..ba92b993a2 100644
--- a/osu.Game/Online/Leaderboards/LeaderboardScore.cs
+++ b/osu.Game/Online/Leaderboards/LeaderboardScore.cs
@@ -41,7 +41,7 @@ namespace osu.Game.Online.Leaderboards
         protected Container RankContainer { get; private set; }
 
         private readonly ScoreInfo score;
-        private readonly int rank;
+        private readonly int? rank;
         private readonly bool allowHighlight;
 
         private Box background;
@@ -58,7 +58,7 @@ namespace osu.Game.Online.Leaderboards
         [Resolved(CanBeNull = true)]
         private DialogOverlay dialogOverlay { get; set; }
 
-        public LeaderboardScore(ScoreInfo score, int rank, bool allowHighlight = true)
+        public LeaderboardScore(ScoreInfo score, int? rank, bool allowHighlight = true)
         {
             this.score = score;
             this.rank = rank;
@@ -90,7 +90,7 @@ namespace osu.Game.Online.Leaderboards
                             Anchor = Anchor.Centre,
                             Origin = Anchor.Centre,
                             Font = OsuFont.GetFont(size: 20, italics: true),
-                            Text = rank.ToMetric(decimals: rank < 100000 ? 1 : 0),
+                            Text = rank == null ? "-" : rank.Value.ToMetric(decimals: rank < 100000 ? 1 : 0),
                         },
                     },
                 },
diff --git a/osu.Game/Overlays/BeatmapSet/Scores/ScoresContainer.cs b/osu.Game/Overlays/BeatmapSet/Scores/ScoresContainer.cs
index 2d8bd10b13..0d0dd08a0f 100644
--- a/osu.Game/Overlays/BeatmapSet/Scores/ScoresContainer.cs
+++ b/osu.Game/Overlays/BeatmapSet/Scores/ScoresContainer.cs
@@ -1,6 +1,7 @@
 // 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.
 
+using System.Diagnostics;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
@@ -70,7 +71,10 @@ namespace osu.Game.Overlays.BeatmapSet.Scores
                 topScoresContainer.Add(new DrawableTopScore(topScore));
 
                 if (userScoreInfo != null && userScoreInfo.OnlineScoreID != topScore.OnlineScoreID)
-                    topScoresContainer.Add(new DrawableTopScore(userScoreInfo, userScore.Position));
+                {
+                    Debug.Assert(userScore.Position != null);
+                    topScoresContainer.Add(new DrawableTopScore(userScoreInfo, userScore.Position.Value));
+                }
             });
         }