diff --git a/db/migrate/20240905024953_move_solved_topic_custom_field_to_discourse_solved_solutions.rb b/db/migrate/20240905024953_move_solved_topic_custom_field_to_discourse_solved_solutions.rb
index be9c3b3..b4139a5 100644
--- a/db/migrate/20240905024953_move_solved_topic_custom_field_to_discourse_solved_solutions.rb
+++ b/db/migrate/20240905024953_move_solved_topic_custom_field_to_discourse_solved_solutions.rb
@@ -7,7 +7,7 @@ class MoveSolvedTopicCustomFieldToDiscourseSolvedSolutions < ActiveRecord::Migra
       t.integer :topic_id, null: false
       t.integer :answer_post_id, null: false
       t.integer :accepter_user_id
-      t.integer :topic_timer_id, null: true
+      t.integer :topic_timer_id
       t.timestamps
     end