From cd3a15aea514234153d0afcaaed0009086492bd9 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Sat, 14 Jan 2023 00:16:06 -0300
Subject: [PATCH] Fix NRE when MemoryUnmappedHandler is called for a destroyed
 channel (#4285)

---
 Ryujinx.Graphics.Gpu/GpuChannel.cs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Ryujinx.Graphics.Gpu/GpuChannel.cs b/Ryujinx.Graphics.Gpu/GpuChannel.cs
index fe8587629..43fa8484b 100644
--- a/Ryujinx.Graphics.Gpu/GpuChannel.cs
+++ b/Ryujinx.Graphics.Gpu/GpuChannel.cs
@@ -73,7 +73,7 @@ namespace Ryujinx.Graphics.Gpu
 
             // Since the memory manager changed, make sure we will get pools from addresses of the new memory manager.
             TextureManager.ReloadPools();
-            MemoryManager.Physical.BufferCache.QueuePrune();
+            memoryManager.Physical.BufferCache.QueuePrune();
         }
 
         /// <summary>
@@ -84,7 +84,9 @@ namespace Ryujinx.Graphics.Gpu
         private void MemoryUnmappedHandler(object sender, UnmapEventArgs e)
         {
             TextureManager.ReloadPools();
-            MemoryManager.Physical.BufferCache.QueuePrune();
+
+            var memoryManager = Volatile.Read(ref _memoryManager);
+            memoryManager?.Physical.BufferCache.QueuePrune();
         }
 
         /// <summary>