From 6ee3462eceab59e6f29fc0d9225dfb195264e015 Mon Sep 17 00:00:00 2001
From: Siegfried Pammer <siegfriedpammer@gmail.com>
Date: Wed, 1 Jul 2026 21:32:05 +0200
Subject: [PATCH] Ignore null C# debug-step produced nodes

Keep existing modified-node candidates when a transform cannot provide a produced node, matching the IL transform helper and preserving highlight fallback quality.

Assisted-by: OpenCode:openai/gpt-5.5:OpenCode
---
 ICSharpCode.Decompiler/CSharp/Transforms/TransformContext.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ICSharpCode.Decompiler/CSharp/Transforms/TransformContext.cs b/ICSharpCode.Decompiler/CSharp/Transforms/TransformContext.cs
index 31dd4f263..13fafaf58 100644
--- a/ICSharpCode.Decompiler/CSharp/Transforms/TransformContext.cs
+++ b/ICSharpCode.Decompiler/CSharp/Transforms/TransformContext.cs
@@ -120,7 +120,7 @@ namespace ICSharpCode.Decompiler.CSharp.Transforms
 		[Conditional("STEP")]
 		internal void EndStep(AstNode? modifiedNode)
 		{
-			if (Stepper.LastStep != null)
+			if (Stepper.LastStep != null && modifiedNode != null)
 			{
 				Stepper.LastStep.ModifiedNode = modifiedNode;
 				TrackModifiedNode(Stepper.LastStep, modifiedNode, insertFirst: true);