array_key_exists(): Using array_key_exists() on objects is deprecated. Use isset() or property_exists() instead 
in '/is/htdocs/wp10562299_E0ZJ5ONIOJ/www/schrader-statistik/libs/Zend/Registry.php' at the line 206

#0  Piwik_ErrorHandler(8192, array_key_exists(): Using array_key_exists() on objects is deprecated. Use isset() or property_exists() instead, /is/htdocs/wp10562299_E0ZJ5ONIOJ/www/schrader-statistik/libs/Zend/Registry.php, 206, Array ([index] => config)) called at [/is/htdocs/wp10562299_E0ZJ5ONIOJ/www/schrader-statistik/libs/Zend/Registry.php:206]
#1  Zend_Registry->offsetExists(config) called at [/is/htdocs/wp10562299_E0ZJ5ONIOJ/www/schrader-statistik/libs/Zend/Registry.php:145]
#2  Zend_Registry::get(config) called at [/is/htdocs/wp10562299_E0ZJ5ONIOJ/www/schrader-statistik/core/FrontController.php:209]
#3  Piwik_FrontController->init() called at [/is/htdocs/wp10562299_E0ZJ5ONIOJ/www/schrader-statistik/index.php:59]