Bulk Password Reset: Error

Hi, just tried this out and got an error:

<b>Warning</b>: in_array() [function.in-array]: Wrong datatype for second argument in <b>/var/www/<sitename>/wp-content/plugins/bulk-password-reset/bulk_password_reset.php</b> on line <b>188</b>

This is PHP 5.2.x running on lighttpd on Ubuntu 8.04.

http://wordpress.org/extend/plugins/bulk-password-reset/