From 6f59e5feec4bf12c88c729e2b93d0d9f06a0f2e6 Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Tue, 18 Jul 2017 16:16:01 +0900
Subject: [PATCH] Add null check on stream

---
 osu.Game/Beatmaps/IO/OszArchiveReader.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/osu.Game/Beatmaps/IO/OszArchiveReader.cs b/osu.Game/Beatmaps/IO/OszArchiveReader.cs
index eb9e740779..a22a5f4cce 100644
--- a/osu.Game/Beatmaps/IO/OszArchiveReader.cs
+++ b/osu.Game/Beatmaps/IO/OszArchiveReader.cs
@@ -15,7 +15,7 @@ namespace osu.Game.Beatmaps.IO
             AddReader<OszArchiveReader>((storage, path) =>
             {
                 using (var stream = storage.GetStream(path))
-                    return ZipFile.IsZipFile(stream, false);
+                    return stream != null && ZipFile.IsZipFile(stream, false);
             });
             OsuLegacyDecoder.Register();
         }