Fix bug.

app/models/seminar_review.rb

@@ -74,13 +74,16 @@ class SeminarReview
   def get_all_seminar_signup_ids(mode = nil)
     if (self.default_topics.include?("seminar_signup_contributes.description") && self.seminar_main.assign_mode == 1) || mode == 1
       final_assign_signup_ids = SeminarSession.where(:id.in=>self.seminar_session_ids).pluck(:seminar_signup_ids).flatten.map{|id| id.to_s} rescue []
-      final_assign_signup_ids + self.seminar_signup_ids - self.remove_seminar_signup_ids
+      result = final_assign_signup_ids + self.seminar_signup_ids - self.remove_seminar_signup_ids
+      result = result.uniq
     else
-      all_seminar_signup_ids
+      result = all_seminar_signup_ids
     end
+    result
   end
   def all_seminar_signup_ids
-    self.seminar_signup_ids - self.remove_seminar_signup_ids + self.default_seminar_signup_ids
+    result = self.seminar_signup_ids - self.remove_seminar_signup_ids + self.default_seminar_signup_ids
+    result.uniq
   end
   def append_default_signup_id(signup_id)
     sid = signup_id.to_s