diff --git a/src/legacy/legacyMigrator.js b/src/legacy/legacyMigrator.js
index 3f4dfd3..2c491e3 100644
--- a/src/legacy/legacyMigrator.js
+++ b/src/legacy/legacyMigrator.js
@@ -187,7 +187,7 @@ async function migrateBlockedUsers() {
     await knex('blocked_users').insert({
       user_id: userId,
       user_name: '',
-      blocked_by: 0,
+      blocked_by: null,
       blocked_at: now
     });
   }