The same problem is in both extensions ezdemo and ezwebin.

To reproduce, choose limitation on content/read policy : Group( Self )
(or States limitation for example)

When you use eztagcloud() operator with permission limitation, you have an SQL error : Query error (1054): Unknown column 'ezcontentobject.owner_id' in 'on clause'. Query: SELECT ezkeyword.keyword, count(ezkeyword.keyword) AS keyword_count
FROM ezkeyword LEFT JOIN ezgroup_perm_tmp_925 ON ezgroup_perm_tmp_925.user_id = ezcontentobject.owner_id,

Thanks.