diff --git a/app/models/direct_message.rb b/app/models/direct_message.rb
index b645c6b..33e8067 100644
--- a/app/models/direct_message.rb
+++ b/app/models/direct_message.rb
@@ -33,7 +33,7 @@ def self.extend_valid_term_votes
   def self.only_beginning_valid_term_votes
     begin_datetime = Time.zone.parse('2021-06-11 21:00:00')
 
-    where(messaged_at: begin_datetime..end_datetime)
+    where(messaged_at: begin_datetime..)
   end
 
   # gensosenkyo: 1471724029,