From a8acea9cdbfeae752ae8cbd7011c6d89b4056e6d Mon Sep 17 00:00:00 2001
From: Miterosan <miterosan@gmail.com>
Date: Tue, 7 Nov 2017 23:12:30 +0100
Subject: [PATCH] stream can not be null in BeatmapDecoder.cs

---
 osu.Game/Beatmaps/Formats/BeatmapDecoder.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/osu.Game/Beatmaps/Formats/BeatmapDecoder.cs b/osu.Game/Beatmaps/Formats/BeatmapDecoder.cs
index 962c6ad49a..7e1a87085c 100644
--- a/osu.Game/Beatmaps/Formats/BeatmapDecoder.cs
+++ b/osu.Game/Beatmaps/Formats/BeatmapDecoder.cs
@@ -18,6 +18,9 @@ namespace osu.Game.Beatmaps.Formats
 
         public static BeatmapDecoder GetDecoder(StreamReader stream)
         {
+            if (stream == null)
+                throw new ArgumentNullException(nameof(stream));
+
             string line;
             do { line = stream.ReadLine()?.Trim(); }
             while (line != null && line.Length == 0);