Logout Error with Defender

Hi I'm getting a logout error below when using Defender?

Warning: array_combine() [function.array-combine]: Both parameters should have at least 1 element in /clientdata/apache-www/n/e/newlifecc.com.au/www/wp-content/plugins/wp-defender/interface/class-wd-event-abstract.php on line 261

Warning: Cannot modify header information - headers already sent by (output started at /clientdata/apache-www/n/e/newlifecc.com.au/www/wp-content/plugins/wp-defender/interface/class-wd-event-abstract.php:261) in /clientdata/apache-www/n/e/newlifecc.com.au/www/wp-includes/pluggable.php on line 1179

I have attempted to change to a default wp theme and still get the issue. I have also dis-activated all plugins apart from WPMUDEV dashboard and Defender but still get the error when logging out?

It maybe the same problem but the login attempts function dosnt seem to work?