small purchase log error

In my backend where you see the Store Sales and try to use the Search function for say a name, etc. it gives this error:

Fatal error: Call to undefined method wpdb::esc_like() in plugins/wp-e-commerce/wpsc-admin/includes/purchase-log-list-table-class.php on line 106

this is line 106:
} $escaped_term = esc_sql( $wpdb->esc_like( $term ) );

has anyone ever seen something like this before?

https://www.ads-software.com/plugins/wp-e-commerce/