Query error

In postgreSQL all selected columns (which are not aggregated) must appear in GROUP BY clause.

In error log:
query: SELECT t.tag, t.tag_id, t.public, COUNT(ti.thread_id) as count FROM prod_pm_tags t LEFT JOIN prod_pm_tags_index ti ON t.tag_id = ti.tag_id WHERE (ti.uid = 90) GROUP BY t.tag_id, t.tag ORDER BY t.tag ASC in modules/privatemsg/privatemsg_filter/privatemsg_filter.module on line 297.

In psql command line:
# SELECT t.tag, t.tag_id, t.public, COUNT(ti.thread_id) as count FROM prod_pm_tags t LEFT JOIN prod_pm_tags_index ti ON t.tag_id = ti.tag_id WHERE (ti.uid = 90) GROUP BY t.tag_id, t.tag ORDER BY t.tag ASC ;
ERROR: column "t.public" must appear in the GROUP BY clause or be used in an aggregate function

The correct query would be:
# SELECT t.tag, t.tag_id, t.public, COUNT(ti.thread_id) as count FROM prod_pm_tags t LEFT JOIN prod_pm_tags_index ti ON t.tag_id = ti.tag_id WHERE (ti.uid = 90) GROUP BY t.tag_id, t.tag, t.public ORDER BY t.tag ASC ;

Please fix.

Thank you,
Gabor