diff --git a/ArcFormats/BlackRainbow/ArcDX.cs b/ArcFormats/BlackRainbow/ArcDX.cs
index f390ba00..66dedce8 100644
--- a/ArcFormats/BlackRainbow/ArcDX.cs
+++ b/ArcFormats/BlackRainbow/ArcDX.cs
@@ -52,7 +52,7 @@ namespace GameRes.Formats.BlackRainbow
             using (var input = file.CreateStream (0, index_length))
             {
                 var reader = new IndexReader (input, file.MaxOffset);
-                if (!reader.ReadDir ("", 8, index_length))
+                if (!reader.ReadDir ("", 8, index_length) || 0 == reader.Dir.Count)
                     return null;
                 return new ArcFile (file, this, reader.Dir);
             }