Empty page after clicking the confirmation button in email

After subscribing to emails for comment updates the user gets a confirmation email. When clicking on the link (confirmation button) the browser page is empty. The area, where the joomla content normally is placed, is missing.

I used the wireframe theme without any overrides. Tested the link with joomla protostar template too.

This is the link from the email:
.../index.php?option=com_komento&task=confirmSubscription&token=58fda8b4663e