From 329241bcde65222d6aeb01b2facddde64076eabf Mon Sep 17 00:00:00 2001
From: Lordfox <c.haendler@lordfox.de>
Date: Sat, 4 Oct 2025 12:10:40 +0200
Subject: [PATCH] hups :)

---
 .../Modules/ConcurrentFlotsamAssetCache.cs                | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/modules/OpenSimConcurrentFlotsamAssetCache/addon-modules/OpenSimConcurrentFlotsamAssetCache/Modules/ConcurrentFlotsamAssetCache.cs b/modules/OpenSimConcurrentFlotsamAssetCache/addon-modules/OpenSimConcurrentFlotsamAssetCache/Modules/ConcurrentFlotsamAssetCache.cs
index 01b6fdb..d5010a4 100644
--- a/modules/OpenSimConcurrentFlotsamAssetCache/addon-modules/OpenSimConcurrentFlotsamAssetCache/Modules/ConcurrentFlotsamAssetCache.cs
+++ b/modules/OpenSimConcurrentFlotsamAssetCache/addon-modules/OpenSimConcurrentFlotsamAssetCache/Modules/ConcurrentFlotsamAssetCache.cs
@@ -547,9 +547,13 @@ namespace OpenSim.Region.CoreModules.Asset
         {
             weakAssetReferences.AddOrUpdate(
                 key,
-                static _ => new WeakReference<AssetBase>(asset),
-                static (_, existing) =>
+                _ => new WeakReference<AssetBase>(asset),
+                (_, existing) =>
                 {
+                    // defensive: handle rare case where existing could be null
+                    if (existing is null)
+                        return new WeakReference<AssetBase>(asset);
+                    
                     existing.SetTarget(asset);
                     return existing;
                 });