diff --git a/osu.Game/Beatmaps/Drawables/BeatmapSetHeader.cs b/osu.Game/Beatmaps/Drawables/BeatmapSetHeader.cs
index 6593ea6de2..8a589ccd30 100644
--- a/osu.Game/Beatmaps/Drawables/BeatmapSetHeader.cs
+++ b/osu.Game/Beatmaps/Drawables/BeatmapSetHeader.cs
@@ -160,6 +160,9 @@ namespace osu.Game.Beatmaps.Drawables
 
         public void AddDifficultyIcons(IEnumerable<BeatmapPanel> panels)
         {
+            if (panels == null)
+                throw new ArgumentNullException(nameof(panels));
+
             foreach (var p in panels)
                 difficultyIcons.Add(new DifficultyIcon(p.Beatmap));
         }