Topic on Extension talk:AddPersonalUrls

When trying to add add a new user page by clicking on the username, I get the following error:

AH01071: Got error 'PHP message: PHP Fatal error:  Call to a member function exists() on a non-object in …/mediawiki/extensions/AddPersonalUrls/AddPersonalUrls.body.php on line 107\n'

I am using MediaWiki 1.29.2 with PHP 5.5.14 with Suhosin 0.9.38.

This should be solved since version 1.1.1.