From cb2bd0273f22bda379979019dc210bc4fdfda792 Mon Sep 17 00:00:00 2001
From: ta264 <ta264@users.noreply.github.com>
Date: Tue, 9 Nov 2021 21:35:20 +0000
Subject: [PATCH] Fixed: Null reference error importing some books

---
 .../BookImport/Identification/IdentificationService.cs          | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/NzbDrone.Core/MediaFiles/BookImport/Identification/IdentificationService.cs b/src/NzbDrone.Core/MediaFiles/BookImport/Identification/IdentificationService.cs
index e3e4daf61..3f3f08e29 100644
--- a/src/NzbDrone.Core/MediaFiles/BookImport/Identification/IdentificationService.cs
+++ b/src/NzbDrone.Core/MediaFiles/BookImport/Identification/IdentificationService.cs
@@ -133,7 +133,7 @@ namespace NzbDrone.Core.MediaFiles.BookImport.Identification
                 candidateReleases = _candidateService.GetRemoteCandidates(localBookRelease, idOverrides);
                 if (!config.AddNewAuthors)
                 {
-                    candidateReleases = candidateReleases.Where(x => x.Edition.Book.Value.Id > 0);
+                    candidateReleases = candidateReleases.Where(x => x.Edition.Book.Value.Id > 0 && x.Edition.Book.Value.AuthorId > 0);
                 }
 
                 usedRemote = true;