array to string conversion in 2.13.1 in 4 places (no replies)

Github issue: [github.com]

There seems to happen array to string conversions in 4 places in Piwik 2.13.1:

WARNING: /srv/www/htdocs/piwik/core/Plugin/Report.php(792): Warning - ucfirst() expects parameter 1 to be string, array given - Piwik 2.13.1

WARNING: /srv/www/htdocs/piwik/core/Http/ControllerResolver.php(133): Warning - substr() expects parameter 1 to be string, array given - Piwik 2.13.1

WARNING: /srv/www/htdocs/piwik/core/Http/ControllerResolver.php(64): Notice - Array to string conversion - Piwik 2.13.1

WARNING: /srv/www/htdocs/piwik/libs/HTML/Common2.php(251): Notice - Array to string conversion - Piwik 2.13.1

Greetings
mkuhn