Error php in log files

I am on NC 11.0. Ubuntu 16.0.4 and Nginx. I am getting an error in the log files.
I am on php 7.0
php -v
PHP 7.0.8-0ubuntu0.16.04.3 (cli) ( NTS )
Copyright © 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright © 1998-2016 Zend Technologies
with Zend OPcache v7.0.8-0ubuntu0.16.04.3, Copyright © 1999-2016, by Zend Technologies

Error PHPkey() expects parameter 1 to be array, string given at /var/www/owncloud/apps/files/lib/Activity/Provider.php#2512016-12-21T16:53:15-0500
Error PHPreset() expects parameter 1 to be array, string given at /var/www/owncloud/apps/files/lib/Activity/Provider.php#2502016-12-21T16:53:15-0500
Error PHPkey() expects parameter 1 to be array, string given at /var/www/owncloud/apps/files/lib/Activity/Provider.php#2512016-12-21T16:53:15-050

Please report here: https://github.com/nextcloud/activity/issues/new