From fca076b9886f8552797e24b23c9f52603c718e5f Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Wed, 17 Aug 2022 17:17:22 +0900
Subject: [PATCH] Fix edge case of realm backup cascading failure

---
 osu.Game/Database/RealmAccess.cs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/osu.Game/Database/RealmAccess.cs b/osu.Game/Database/RealmAccess.cs
index cdaf35a1fb..dd219cc1aa 100644
--- a/osu.Game/Database/RealmAccess.cs
+++ b/osu.Game/Database/RealmAccess.cs
@@ -902,7 +902,14 @@ namespace osu.Game.Database
                 {
                     using (var source = storage.GetStream(Filename, mode: FileMode.Open))
                     using (var destination = storage.GetStream(backupFilename, FileAccess.Write, FileMode.CreateNew))
+                    {
+                        // source may not exist.
+                        if (source == null)
+                            return;
+
                         source.CopyTo(destination);
+                    }
+
                     return;
                 }
                 catch (IOException)