MySQL error in file: /engine/classes/comments.class.php at line 838

Error Number: 1052

The Error returned was:
Column 'fullname' in field list is ambiguous

SQL query:

SELECT glaza_comments.id, post_id, glaza_comments.user_id, date, autor as gast_name, glaza_comments.email as gast_email, text, ip, is_register, glaza_comments.rating, glaza_comments.vote_num, glaza_comments.parent, name, glaza_users.email, news_num, comm_num, user_group, lastdate, reg_date, signature, foto, fullname, land, xfields FROM glaza_comments LEFT JOIN glaza_users ON glaza_comments.user_id=glaza_users.user_id WHERE glaza_comments.post_id = '2128' ORDER BY glaza_comments.id ASC