Issue with accessing admin account

[kukonja6]

Trying to access the Account or Domains page from the drop-down menu on the upper right-hand side.

On click, it gives an error with the following stack trace:

ErrorException thrown with message "Trying to get property of non-object"

Stacktrace:
#12 ErrorException in /var/kb/themes/zkillboard/zkillboard.php:9
#11 Slim\Slim:handleErrors in /var/kb/themes/zkillboard/zkillboard.php:9
#10 zkillboard:availableStyles in /var/kb/view/account.php:219
#9 include in /var/kb/routes.php:158
#8 {closure} in <#unknown>:0
#7 call_user_func_array in /var/kb/vendor/slim/slim/Slim/Route.php:468
#6 Slim\Route:dispatch in /var/kb/vendor/slim/slim/Slim/Slim.php:1357
#5 Slim\Slim:call in /var/kb/vendor/slim/slim/Slim/Middleware/Flash.php:85
#4 Slim\Middleware\Flash:call in /var/kb/vendor/slim/slim/Slim/Middleware/MethodOverride.php:92
#3 Slim\Middleware\MethodOverride:call in /var/kb/vendor/zeuxisoo/slim-whoops/src/Zeuxisoo/Whoops/Provider/Slim/WhoopsMiddleware.php:87
#2 Zeuxisoo\Whoops\Provider\Slim\WhoopsMiddleware:call in /var/kb/vendor/slim/slim/Slim/Middleware/PrettyExceptions.php:67
#1 Slim\Middleware\PrettyExceptions:call in /var/kb/vendor/slim/slim/Slim/Slim.php:1302
#0 Slim\Slim:run in /var/kb/index.php:57

php -v

PHP 5.5.9

apache2 -v

Apache/2.4.7