--- alexandria-0.6.8/./lib/alexandria/book_providers/z3950.rb.next	2009-12-22 06:13:29.000000000 +0900
+++ alexandria-0.6.8/./lib/alexandria/book_providers/z3950.rb	2012-04-10 23:40:53.000000000 +0900
@@ -100,7 +100,7 @@
           msg
         }
         
-        next if marc.title.nil? # or marc.authors.empty?
+        raise if marc.title.nil? # or marc.authors.empty?
         
         isbn = isbn or marc.isbn
         isbn = Library.canonicalise_ean(isbn)