EC-CUBE 2.11.4
PostgreSQL 8.1.3

商品管理から条件無しで検索した後にCSVダウンロードを行うとエラーが発生致します。
検索結果の件数は1000件程度でした。

検索条件でカテゴリーを選択した場合等、結果件数が数百になるとダウンロードできます。

エラーが発生したSQLをsite.logから抽出しphpPgAdminでSQLを実行しましたが、下記のエラーが発生しました。
ERROR: null array elements not supported

実行したSQL文:

SELECT
product_id,
product_class_id,
parent_class_combination_id,
class_combination_id,
parent_classcategory_id,
classcategory_id,
parent_classcategory_name,
classcategory_name,
name,
status,
del_flg,
product_type_id,
product_code,
stock,
stock_unlimited,
sale_limit,
price01,
price02,
deliv_fee,
point_rate,
down_filename,
down_realfilename,
(SELECT comment FROM dtb_recommend_products
WHERE prdcls.product_id = dtb_recommend_products.product_id ORDER BY rank DESC,
recommend_product_id DESC limit 1 offset 5) AS recommend_comment6, (SELECT ARRAY_TO_STRING(ARRAY(SELECT product_status_id FROM dtb_product_status WHERE dtb_product_status.product_id = prdcls.product_id and del_flg = 0 ORDER BY dtb_product_status.product_status_id), ',')) as product_statuses, (SELECT ARRAY_TO_STRING(ARRAY(SELECT name FROM dtb_product_status LEFT JOIN mtb_status ON dtb_product_status.product_status_id = mtb_status.id WHERE dtb_product_status.product_id = prdcls.product_id and del_flg = 0 ORDER BY dtb_product_status.product_status_id), ',')) as product_status_names, (SELECT ARRAY_TO_STRING(ARRAY(SELECT category_id FROM dtb_product_categories WHERE dtb_product_categories.product_id = prdcls.product_id ORDER BY dtb_product_categories.rank), ',')) as category_ids, (SELECT ARRAY_TO_STRING(ARRAY(SELECT category_name FROM dtb_product_categories LEFT JOIN dtb_category ON dtb_product_categories.category_id = dtb_category.category_id WHERE dtb_product_categories.product_id = prdcls.product_id ORDER BY dtb_product_categories.rank), ',')) as category_names FROM (
SELECT dtb_products.*,
dtb_products_class.product_class_id,
dtb_products_class.class_combination_id,
dtb_products_class.product_type_id,
dtb_products_class.product_code,
dtb_products_class.jan_code,
dtb_products_class.stock,
dtb_products_class.stock_unlimited,
dtb_products_class.sale_limit,
dtb_products_class.price01,
dtb_products_class.price02,
dtb_products_class.deliv_fee,
dtb_products_class.point_rate,
dtb_products_class.down_filename,
dtb_products_class.down_realfilename,
dtb_class_combination.parent_class_combination_id,
dtb_class_combination.classcategory_id,
dtb_class_combination.level as classlevel,
Tpcm.classcategory_id as parent_classcategory_id,
Tpcm.level as parent_classlevel,
Tcc1.class_id as class_id,
Tcc1.name as classcategory_name,
Tcc2.class_id as parent_class_id,
Tcc2.name as parent_classcategory_name
FROM dtb_products
LEFT JOIN dtb_products_class
ON dtb_products.product_id = dtb_products_class.product_id
LEFT JOIN dtb_class_combination
ON dtb_products_class.class_combination_id = dtb_class_combination.class_combination_id
LEFT JOIN dtb_class_combination as Tpcm
ON dtb_class_combination.parent_class_combination_id = Tpcm.class_combination_id
LEFT JOIN dtb_classcategory as Tcc1
ON dtb_class_combination.classcategory_id = Tcc1.classcategory_id
LEFT JOIN dtb_classcategory as Tcc2
ON Tpcm.classcategory_id = Tcc2.classcategory_id
WHERE dtb_products_class.del_flg = 0
) as prdcls WHERE del_flg = 0 ORDER BY update_date DESC


見苦しい内容で申し訳ありませんが、どなたか原因等わかりますでしょうか？