I'm getting the warning "Warning: Missing argument 2 for wpdb::prepare()" when on mem

I get the following message when I go to membership pages after updating to wordpress 3.5:
"Warning: Missing argument 2 for wpdb::prepare(), called in /home8/frontgro/public_html/silat/wp-content/plugins/membership/membershipincludes/classes/membershipadmin.php on line 569 and defined in /home8/frontgro/public_html/silat/wp-includes/wp-db.php on line 990"

I haven't changed any of the core membership files and was wandering if there is some conflict with the new wordpress and membership.