From 26fd92f17a0feb062e4ead505723f640c5476ed9 Mon Sep 17 00:00:00 2001
From: Kenneth Skovhede <kenneth@duplicati.com>
Date: Mon, 26 Jan 2026 17:22:40 +0100
Subject: [PATCH] Attempt to fix a race in unittests

---
 Duplicati/Library/Main/Volumes/IndexVolumeWriter.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Duplicati/Library/Main/Volumes/IndexVolumeWriter.cs b/Duplicati/Library/Main/Volumes/IndexVolumeWriter.cs
index 47fd82175..becb7f055 100644
--- a/Duplicati/Library/Main/Volumes/IndexVolumeWriter.cs
+++ b/Duplicati/Library/Main/Volumes/IndexVolumeWriter.cs
@@ -76,6 +76,11 @@ namespace Duplicati.Library.Main.Volumes
 
         public void FinishVolume(string volumehash, long volumesize)
         {
+            // If StartVolume was never called, m_writer will be null
+            // This can happen if the volume was created but never used
+            if (m_writer == null || m_streamwriter == null)
+                return;
+
             m_writer.WriteEndArray();
             m_writer.WritePropertyName("volumehash");
             m_writer.WriteValue(volumehash);