some errors after clicking "add comment"

after clicking "add comment" there are six notices on the recent log messages page with the location http://www.blabla.com/ajax/inline_comments/add_comments in that order

Notice: Undefined property: stdClass::$registered_name in comment_form() (line 1899 of /var/www/.../html/modules/comment/comment.module).

Notice: Undefined property: stdClass::$is_anonymous in comment_submit() (line 2159 of /var/www/.../html/modules/comment/comment.module).

Notice: Undefined property: stdClass::$is_anonymous in comment_submit() (line 2164 of /var/www/.../html/modules/comment/comment.module).

Notice: Undefined property: stdClass::$subject in comment_submit() (line 2169 of /var/www/.../html/modules/comment/comment.module).

Notice: Undefined property: stdClass::$cid in comment_save() (line 1473 of /var/www/.../html/modules/comment/comment.module).

Notice: Undefined property: stdClass::$pid in comment_save() (line 1496 of /var/www/.../html/modules/comment/comment.module).