[Plugin: WP-UserOnline] Errors in the Admin.php file

On the options page, under User(s) Browsing Site I’m getting this error:

Warning: array_keys() [function.array-keys]: The first argument should be an array in E:\inetpub\vhosts\[sitename-excluded]\subdomains\dev\httpdocs\wp-content\plugins\wp-useronline\admin.php on line 264

Warning: Invalid argument supplied for foreach() in E:\inetpub\vhosts\[sitename-excluded]\subdomains\dev\httpdocs\wp-content\plugins\wp-useronline\admin.php on line 264

Also under User(s) Browsing Page this error occurs:

Warning: array_keys() [function.array-keys]: The first argument should be an array in E:\inetpub\vhosts\[sitename-excluded]\subdomains\dev\httpdocs\wp-content\plugins\wp-useronline\admin.php on line 264

Warning: Invalid argument supplied for foreach() in E:\inetpub\vhosts\[sitename-excluded]\subdomains\dev\httpdocs\wp-content\plugins\wp-useronline\admin.php on line 264