From 1de1b882e30653438c155add1222860ec2134a20 Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Wed, 13 Sep 2017 10:29:09 +0900
Subject: [PATCH] Fix BeatmapInfo's comparator when not being sourced from
 database

---
 osu.Game/Beatmaps/BeatmapInfo.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/osu.Game/Beatmaps/BeatmapInfo.cs b/osu.Game/Beatmaps/BeatmapInfo.cs
index c962201fe3..0776669811 100644
--- a/osu.Game/Beatmaps/BeatmapInfo.cs
+++ b/osu.Game/Beatmaps/BeatmapInfo.cs
@@ -100,6 +100,11 @@ namespace osu.Game.Beatmaps
 
         public bool Equals(BeatmapInfo other)
         {
+            if (ID == 0 || other?.ID == 0)
+                // one of the two BeatmapInfos we are comparing isn't sourced from a database.
+                // fall back to reference equality.
+                return ReferenceEquals(this, other);
+
             return ID == other?.ID;
         }