diff --git a/fgu_sync.rake b/fgu_sync.rake
index 19bb346..1dca0f5 100644
--- a/fgu_sync.rake
+++ b/fgu_sync.rake
@@ -74,7 +74,7 @@ namespace :fgu_sync do
 
         jp = JournalPaper.where(:rss2_id => rss2id).first rescue nil
         jp_data = {
-          :publication_date => pd, :rss2_id => rss2id, :year => pd.strftime("%Y"),
+          :publication_date => pd, :rss2_id => rss2id, :year => (pd ? pd.strftime("%Y") : ""),
           :authors_translations =>  authors, :paper_title_translations => paper_title,
           :journal_title_translations => journal_title, :vol_no => dt["vol_no"], :issue_no => dt["issue_no"],
           :note => note, :form_to_start => from_to[0], :form_to_end => from_to[1]
@@ -121,7 +121,7 @@ namespace :fgu_sync do
         note = dt["department"] + " " + dt["note"]
 
         cp = WritingConference.where(:rss2_id => rss2id).first rescue nil
-        cp_data = {:period_start_date => start_date, :period_end_date => end_date, :rss2_id => rss2id, :year => end_date.strftime("%Y"), :authors_translations =>  authors, :paper_title_translations => paper_title, :conference_title_translations => conference_title, :note => note, :location_translations => {"en" => dt["location"], "zh_tw" => dt["location"]}}
+        cp_data = {:period_start_date => start_date, :period_end_date => end_date, :rss2_id => rss2id, :year => (end_date ? end_date.strftime("%Y") : ""), :authors_translations =>  authors, :paper_title_translations => paper_title, :conference_title_translations => conference_title, :note => note, :location_translations => {"en" => dt["location"], "zh_tw" => dt["location"]}}
         if cp.nil?
           cp = WritingConference.new(cp_data)
           puts "Saving new conference."
@@ -174,7 +174,7 @@ namespace :fgu_sync do
         end
 
         book = Book.where(:rss2_id => rss2id).first rescue nil
-        book_data = {:publish_date => pd, :rss2_id => rss2id, :year => pd.strftime("%Y"), :authors_translations =>  authors, :publisher_translations => publisher, :book_title_translations => book_title, :isbn => dt["isbn"], :note => note, :language => dt["language"], :member_profile => mp}
+        book_data = {:publish_date => pd, :rss2_id => rss2id, :year => (pd ? pd.strftime("%Y") : ""), :authors_translations =>  authors, :publisher_translations => publisher, :book_title_translations => book_title, :isbn => dt["isbn"], :note => note, :language => dt["language"], :member_profile => mp}
         if book.nil?
           book = Book.new(book_data)
           puts "Saving new book."