It has come to my attention that this plugin may not work when you have a large userbase. I would like to note that if you receive a memory exhausted error for database.php, this means you're trying to make a request of too much information than what is allotted by your PHP configuration.

Until I can update the plugin to let your export only a set amount of users at a time, please contact me with your website, and ftp details so I can work on the possible error for you.

Thank you :)