Busy.org errors: links in Notifications.

Expected behavior.

When we click on any notification about one of the new comments in the post / comment, it should be redirected to that comment.

Real behavior.

When we click on any notification about any new comment in the post / comment, you are redirected to "Page not found".

The problem can only be found in the Notifications page.

Click on the notifications and click on the "See all" link:
Go to busy.org

Click on any of the notification to have a new comment:

You will be directed to "Page not found":

The reason is that your username is not included in the link:

Browser: Safari Version 11.0.1 (13604.3.5), Firefox 57.0.4, Google Chrome 64.0.3282.140
Operating system: macOS High Sierra 10.13.3

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