Error 1054

I am getting this error on browsing the ED Toolbar > Forums Link (included in site details)

1054 Unknown column 'Array' in 'where clause' SQL=select SQL_CALC_FOUND_ROWS a.`id` from `#__discuss_category` as a where a.parent_id = Array and a.`published` = '1' and 1 <= (SELECT COUNT(1) FROM `#__discuss_category` as acat WHERE acat.`id` = a.id AND ( ( acat.`private` = 0 ) OR ( (acat.`private` = 1) AND (0 > 0) ) OR ( (acat.`private` = 2) AND ( (select count(1) from `#__discuss_category_acl_map` as cacl WHERE cacl.`category_id` = acat.id AND cacl.`acl_id` = 2 AND cacl.type = 'group' AND cacl.`content_id` in (1)) > 0 ) ) ) ) ORDER BY a.`lft` asc LIMIT 0, 5

I have set this up on a test site so if there are any code changes required please let me know so I can apply to my live site.

Jordan