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