Membership plugin + All In One SEO plugin causing errors

Hello,

Whenever having both the Membership plugin and the All in One SEO plugin activated I get the following error when trying to view premium content when NOT logged in:

Catchable fatal error: Object of class WP_Error could not be converted to string in /home/horsewhi/public_html/wp-content/plugins/all-in-one-seo-pack/aioseop.class.php on line 377

The error doesn't occur whenever viewing this content as a premium member, only when not logged in.

I noticed other people having some issues with All In One SEO plugin however my issue seems to be a little different.

Does anyone have any ideas as to how to fix this? I might consider scrapping the All In One SEO plugin and opting to add my meta data via custom fields instead.

Thanks!