Hello, after upgrade to the last version, i can't upgrade my website plugins, when i try to upgrade any plugin, the browser take me to a blank page wich display this error.

Message: Argument 1 passed to UTIL_Ftp::getConnection() must be an array, null given, called in /home/xxxxxxx/public_html/ow_system_plugins/admin/controllers/plugins.php on line 720 and defined
File: /home/xxxxxx/public_html/ow_utilities/ftp.php
Line: 109