diff --git a/db/migrate/20190724055909_move_to_managed_authenticator.rb b/db/migrate/20190724055909_move_to_managed_authenticator.rb
index 8db23ca..5ee2735 100644
--- a/db/migrate/20190724055909_move_to_managed_authenticator.rb
+++ b/db/migrate/20190724055909_move_to_managed_authenticator.rb
@@ -15,6 +15,8 @@ class MoveToManagedAuthenticator < ActiveRecord::Migration[5.2]
       CURRENT_TIMESTAMP
     FROM plugin_store_rows
     WHERE plugin_name = 'oauth2_basic'
+    ON CONFLICT (provider_name, user_id)
+    DO NOTHING
     SQL
   end
 end