diff --git a/lib/tasks/sync_ntnu_personal_data_tasks.rake b/lib/tasks/sync_ntnu_personal_data_tasks.rake
index efa69a8..120a983 100644
--- a/lib/tasks/sync_ntnu_personal_data_tasks.rake
+++ b/lib/tasks/sync_ntnu_personal_data_tasks.rake
@@ -455,7 +455,7 @@ namespace :sync_ntnu_personal_plugins do
         tmp && (tmp1 || tmp2 || tmp3 || tmp4)
       end
       if books_for_user.count != 0
-        Book.where(member_profile_id: user.member_profile_id,:pages=>nil).destroy
+        Book.where(member_profile_id: user.member_profile_id).destroy
       end
       NtnuSyncPlugin.sync_academic_treatise_books(query_result, user)
       NtnuSyncPlugin.sync_academic_book_chapters(query_result, user)