WP is throwing some warnings in get_term_link() because it's not finding the expected object attribute. The plugin code causing this is right after the sql query that fetches custom taxonomies:
get_term_link($term, $term->_taxonomy)
WP however expects get_term_link($term, $term->taxonomy), which means that inside get_term_link the code doesn't branch out as intended and returns an incomplete link.
Just wondering if this is intentional or a bug?