diff --git a/FileLiberator/DownloadDecryptBook.cs b/FileLiberator/DownloadDecryptBook.cs
index cc22ef7e..89934d4b 100644
--- a/FileLiberator/DownloadDecryptBook.cs
+++ b/FileLiberator/DownloadDecryptBook.cs
@@ -218,7 +218,7 @@ namespace FileLiberator
 
         public void Cancel()
         {
-            aaxcDownloader.Cancel();
+            aaxcDownloader?.Cancel();
         }
     }
 }