'undefined' title if an object doesn't have a title

[sdevalk]

Scenario: in the manage app I want to add a new object. I click on the '+' sign in a collection; the object is created automatically. I go back to the collections page, with an overview of the objects, and then click on the card of the new object (title: 'Naam onbekend'). On the object page in the <title> the word 'undefined' is shown (see screenshot).