diff --git a/1.4/Assemblies/PerformanceFish.dll b/1.4/Assemblies/PerformanceFish.dll
index 2ce0ba9..f9f3571 100644
Binary files a/1.4/Assemblies/PerformanceFish.dll and b/1.4/Assemblies/PerformanceFish.dll differ
diff --git a/1.4/Assemblies/PerformanceFish.pdb b/1.4/Assemblies/PerformanceFish.pdb
index ca25333..e1956e5 100644
Binary files a/1.4/Assemblies/PerformanceFish.pdb and b/1.4/Assemblies/PerformanceFish.pdb differ
diff --git a/Source/PerformanceFish/DDSLoader.cs b/Source/PerformanceFish/DDSLoader.cs
index 08ee10e..e7667a1 100644
--- a/Source/PerformanceFish/DDSLoader.cs
+++ b/Source/PerformanceFish/DDSLoader.cs
@@ -185,5 +185,5 @@ public static class DDSLoader
 	}
 
 	private static bool FourCcEquals(IList<byte> bytes, string s)
-		=> bytes[0] == s[0] && bytes[1] == s[1] && bytes[2] == s[2] && bytes[3] == s[3];
+		=> bytes.Count >= 4 && bytes[0] == s[0] && bytes[1] == s[1] && bytes[2] == s[2] && bytes[3] == s[3];
 }
\ No newline at end of file
diff --git a/Source/PerformanceFish/Prepatching/PrepatchManager.cs b/Source/PerformanceFish/Prepatching/PrepatchManager.cs
index b9540bf..3adc290 100644
--- a/Source/PerformanceFish/Prepatching/PrepatchManager.cs
+++ b/Source/PerformanceFish/Prepatching/PrepatchManager.cs
@@ -100,8 +100,11 @@ public static class PrepatchManager
 	{
 		var types = module.Types;
 		
-		Parallel.For(0, types.Count, // about 20% faster than sequential for in testing
-			i => ModifyAllMethodsIn(types[i]));
+		// Parallel.For(0, types.Count, // about 20% faster than sequential for in testing
+		// 	i => ModifyAllMethodsIn(types[i]));
+
+		for (var i = 0; i < types.Count; i++)
+			ModifyAllMethodsIn(types[i]);
 	}
 
 	private static void ModifyAllMethodsIn(TypeDefinition type)
diff --git a/Source/PerformanceFish/TextureLoadingPatches.cs b/Source/PerformanceFish/TextureLoadingPatches.cs
index 8ff4532..22b1fa8 100644
--- a/Source/PerformanceFish/TextureLoadingPatches.cs
+++ b/Source/PerformanceFish/TextureLoadingPatches.cs
@@ -41,7 +41,7 @@ public class TextureLoadingPatches : ClassWithFishPrepatches
 		public static bool Prefix<T>(VirtualFile file, ref LoadedContentItem<T>? __result) where T : class
 		{
 			if (typeof(T) != typeof(Texture2D)
-				|| GetFileInfo(file).Extension.Equals(DDS_EXTENSION, StringComparison.OrdinalIgnoreCase)
+				|| (GetFileInfo(file)?.Extension.Equals(DDS_EXTENSION, StringComparison.OrdinalIgnoreCase) ?? true)
 				|| !File.Exists(Path.ChangeExtension(file.FullPath, DDS_EXTENSION)))
 			{
 				return true;
@@ -71,12 +71,12 @@ public class TextureLoadingPatches : ClassWithFishPrepatches
 			Texture2D? texture2D;
 
 			var fileInfo = GetFileInfo(file);
-			var isDds = fileInfo.Extension.Equals(DDS_EXTENSION, StringComparison.OrdinalIgnoreCase);
+			var isDds = fileInfo?.Extension.Equals(DDS_EXTENSION, StringComparison.OrdinalIgnoreCase) ?? false;
 			var hasStoredMipMaps = false;
 			
 			if (isDds)
 			{
-				texture2D = DDSLoader.LoadDDS(fileInfo.OpenRead(), out hasStoredMipMaps);
+				texture2D = DDSLoader.LoadDDS(fileInfo!.OpenRead(), out hasStoredMipMaps);
 				
 				if (!DDSLoader.error.NullOrEmpty())
 					LogDDSLoadingError(file);
@@ -143,7 +143,8 @@ public class TextureLoadingPatches : ClassWithFishPrepatches
 			=> Log.Warning($"DDS error at '{file.FullPath}': {DDSLoader.error}");
 	}
 
-	public static FileInfo GetFileInfo(VirtualFile file) => ((FilesystemFile)file).fileInfo;
+	public static FileInfo? GetFileInfo(VirtualFile file)
+		=> file is FilesystemFile systemFile ? systemFile.fileInfo : null;
 
 	public class GetAllFilesForModPatch : FishPrepatch
 	{