forum posting of viewing posts yields "Column 'approved' in where clause is ambiguous" to non admins

Error Error

Ha hagut un error en una petició de la base de dades!

Context:
File	tiki-view_forum_thread.php
Url	tiki-view_forum_thread.php?comments_parentId=3&forumId=1
Query:
select tc1.`threadId`, tc1.`object`, tc1.`objectType`, tc1.`parentId`, tc1.`userName`, tc1.`commentDate`, tc1.`hits`, tc1.`type`, tc1.`points`, tc1.`votes`, tc1.`average`, tc1.`title`, tc1.`data`, tc1.`hash`, tc1.`user_ip`, tc1.`summary`, tc1.`smiley`, tc1.`message_id`, tc1.`in_reply_to`, tc1.`comment_rating` from `tiki_comments` as tc1 left outer join `tiki_comments` as tc2 on tc1.`in_reply_to` = tc2.`message_id` and tc1.`parentId` = ? and tc2.`parentId` = ? where tc1.`objectType` = ? and tc1.`object`=? and tc1.`parentId`=? and tc1.`average`>=? and `approved`=? and (tc1.`in_reply_to` = ? or (tc2.`in_reply_to` = "" or tc2.`in_reply_to` is null or tc2.message_id is null or tc2.parentid = 0)) order by tc1.`commentDate` asc,tc1.`threadId`
Values:
0	3
1	3
2	forum
3	1
4	3
5	0
6	y
7	prova-0-21fe72956f@moviments.net
Message:
Column 'approved' in where clause is ambiguous
Built query was probably:
select tc1.`threadId`, tc1.`object`, tc1.`objectType`, tc1.`parentId`, tc1.`userName`, tc1.`commentDate`, tc1.`hits`, tc1.`type`, tc1.`points`, tc1.`votes`, tc1.`average`, tc1.`title`, tc1.`data`, tc1.`hash`, tc1.`user_ip`, tc1.`summary`, tc1.`smiley`, tc1.`message_id`, tc1.`in_reply_to`, tc1.`comment_rating` from `tiki_comments` as tc1 left outer join `tiki_comments` as tc2 on tc1.`in_reply_to` = tc2.`message_id` and tc1.`parentId` = '3' and tc2.`parentId` = '3' where tc1.`objectType` = 'forum' and tc1.`object`='1' and tc1.`parentId`='3' and tc1.`average`>='0' and `approved`='y' and (tc1.`in_reply_to` = 'prova-0-21fe72956f@moviments.net' or (tc2.`in_reply_to` = "" or tc2.`in_reply_to` is null or tc2.message_id is null or tc2.parentid = 0)) order by tc1.`commentDate` asc,tc1.`threadId`

--- lib/commentslib.php	(revision 16643)
+++ lib/commentslib.php	(working copy)
@@ -1615,13 +1615,13 @@
 	$bindvars = array_merge(array($object[0], $object[1], (float) $threshold), $bind_time);
 
 	if ( $tiki_p_admin_comments != 'y' ) {
-		$queue_cond = 'and `approved`=?';
+		$queue_cond = 'and tc1.`approved`=?';
 		$bindvars[] = $approved;
 	} else {
 		$queue_cond = '';
 	}
 
-	$query = "select count(*) from `tiki_comments` where
+	$query = "select count(*) from `tiki_comments` as tc1 where
 	    `objectType`=? and `object`=? and `average` < ? $time_cond $queue_cond";
 	$below = $this->getOne($query, $bindvars);