Overview

• The incident occurred that caused forced log out for almost all users.
• The cause is the server program bug, and it has been fixed already.
• There are no effects for the data which is not login session.

Detail

Last week, the incident occurred that causes forced log out. Almost all users were affected. Sorry for the problem.

We will explain the cause.

At first, the login session has the expiration. When expired, you will log out automatically. But if you use the app continuously, the expiration will be extended automatically. So if you use the app daily, the session will not be expired so often.

But in this time the server program had the bug, the feature of extending the expiration did not work. So the many sessions expired after 14 May.

Current Status

We fixed the bug. The same incident will not occur.

Only the login session data was affected, and no effects for the data which is not login session.