diff --git a/source/SongCore/Loader.cs b/source/SongCore/Loader.cs
index dc1bde2..813c7f0 100644
--- a/source/SongCore/Loader.cs
+++ b/source/SongCore/Loader.cs
@@ -455,13 +455,19 @@ void AddOfficialBeatmapLevelsRepository(BeatmapLevelsRepository levelsRepository
                                     .Where(d => d.Exists && !d.Attributes.HasFlag(FileAttributes.Hidden))
                                     .Select(d => d.FullName)))
                             .ToHashSet();
+                        List<string> folderPathsToRemove = [];
                         foreach (var loadedSaveData in _customLevelLoader._loadedBeatmapSaveData.Values)
                         {
                             if (!folders.Contains(loadedSaveData.customLevelFolderInfo.folderPath))
                             {
-                                DeleteSingleSong(loadedSaveData.customLevelFolderInfo.folderPath, false);
+                                folderPathsToRemove.Add(loadedSaveData.customLevelFolderInfo.folderPath);
                             }
                         }
+
+                        foreach (string? folderPath in folderPathsToRemove)
+                        {
+                            DeleteSingleSong(folderPath, false);
+                        }
                     }
 
                     Parallel.ForEach(songFolders, parallelOptions, folder =>
diff --git a/source/SongCore/SongCore.csproj b/source/SongCore/SongCore.csproj
index 88ea0d7..ef1ded0 100644
--- a/source/SongCore/SongCore.csproj
+++ b/source/SongCore/SongCore.csproj
@@ -32,6 +32,10 @@
       <HintPath>$(BeatSaberDir)\Libs\0Harmony.dll</HintPath>
       <Private>false</Private>
     </Reference>
+    <Reference Include="AdditionalContentModel.Interfaces">
+      <HintPath>$(BeatSaberDir)\Beat Saber_Data\Managed\AdditionalContentModel.Interfaces.dll</HintPath>
+      <Private>false</Private>
+    </Reference>
     <Reference Include="BeatmapCore" />
     <Reference Include="BeatSaber.ViewSystem" />
     <Reference Include="BGLib.AppFlow" />