/admin/content/location/131 :

Type error: Argument 1 passed to eZ\Publish\Core\SignalSlot\BookmarkService::isBookmarked() must be an instance of eZ\Publish\API\Repository\Values\Content\Location, null given, called in /var/www/ezplatform-internet/vendor/ezsystems/ezplatform-admin-ui/src/bundle/Controller/ContentViewController.php on line 366 [in vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/SignalSlot/BookmarkService.php:80]

Maybe related to : https://jira.ez.no/browse/EZP-29342