diff --git a/app/controllers/personal_books_controller.rb b/app/controllers/personal_books_controller.rb
index 657f6d4..97195a3 100644
--- a/app/controllers/personal_books_controller.rb
+++ b/app/controllers/personal_books_controller.rb
@@ -6,7 +6,7 @@ class PersonalBooksController < ApplicationController
         "book_title" => book.create_link,
         "author" => book.authors,
         "year" => book.year,
-        "book_paper_type" => book.book_type.title,
+        "book_paper_type" => (book.book_type.title rescue nil),
         "link_to_show" => OrbitHelper.url_to_show(book.to_param)
       }
     end