From be09385c9d7526de7d3f03ca25c5289cc8ad4a4f Mon Sep 17 00:00:00 2001
From: ta264 <ta264@users.noreply.github.com>
Date: Wed, 12 May 2021 21:26:52 +0100
Subject: [PATCH] Fixed: Null reference processing failed import for unknown
 book

---
 src/NzbDrone.Core/History/HistoryService.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/NzbDrone.Core/History/HistoryService.cs b/src/NzbDrone.Core/History/HistoryService.cs
index 5baf62658..76f8a980d 100644
--- a/src/NzbDrone.Core/History/HistoryService.cs
+++ b/src/NzbDrone.Core/History/HistoryService.cs
@@ -181,6 +181,11 @@ public void Handle(BookGrabbedEvent message)
 
         public void Handle(BookImportIncompleteEvent message)
         {
+            if (message.TrackedDownload.RemoteBook == null)
+            {
+                return;
+            }
+
             foreach (var book in message.TrackedDownload.RemoteBook.Books)
             {
                 var history = new History