From 4638bc1783cd75f44a7dc060461a4c25ff0c00a7 Mon Sep 17 00:00:00 2001
From: Daniel Gehriger <gehriger@gmail.com>
Date: Fri, 22 Jun 2018 23:07:33 +0200
Subject: [PATCH] See #3291: Additional null check

---
 Duplicati/Library/Snapshots/UsnJournalService.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Duplicati/Library/Snapshots/UsnJournalService.cs b/Duplicati/Library/Snapshots/UsnJournalService.cs
index 143ae6f48..2bc4a5350 100644
--- a/Duplicati/Library/Snapshots/UsnJournalService.cs
+++ b/Duplicati/Library/Snapshots/UsnJournalService.cs
@@ -60,6 +60,9 @@ namespace Duplicati.Library.Snapshots
         /// <returns></returns>
         private Dictionary<string, VolumeData> Initialize(IFilter emitFilter, IEnumerable<USNJournalDataEntry> prevJournalData)
         {
+            if (prevJournalData == null)
+                throw new UsnJournalSoftFailureException();
+
             var result = new Dictionary<string, VolumeData>();
 
             // get filter identifying current source filter / sources configuration