diff --git a/app/models/ask_question.rb b/app/models/ask_question.rb
index 8132f50..3530f5e 100644
--- a/app/models/ask_question.rb
+++ b/app/models/ask_question.rb
@@ -51,8 +51,8 @@ class AskQuestion
       end
     end
     email_address = email_address +[self.mail] if !self.mail.blank?
-    email_address.flatten
-    email_address.uniq!
+    email_address = email_address.flatten
+    email_address.uniq
   end
   def get_serial_number(last_serial_number=nil, display_length=nil)
     if display_length.nil? && last_serial_number.nil?