Steps to reproduce:

1. Start editing the root location in admin UI
2. Click on the "cancel" button in the top left

Expected result:

User is redirected to the full view page

Actual result:

The following error is shown:

Return value of eZ\Publish\Core\Repository\Values\Content\Content::getContentType() must be an instance of eZ\Publish\API\Repository\Values\ContentType\ContentType, null returned