Invalid argument in wp-security-file-scan.php

Hi,
I got this in wp-admin/error_log today:

[09-Feb-2015 18:04:50 UTC] PHP Warning: Invalid argument supplied for foreach() in /wp-content/plugins/all-in-one-wp-security-and-firewall/classes/wp-security-file-scan.php on line 247

Using v3.8.9 of the plugin.

Thanks,
Paul

https://wordpress.org/plugins/all-in-one-wp-security-and-firewall/