下記環境で、EC-Cubeを構築しようとしております。

EC-Cube 2.13.0
PHP 5.2.17
PostgreSQL 8.1.23


管理画面から規格情報を登録や更新をしようとすると、下記エラーがでます。
解決方法が分かりましたら、ご教示いただけると助かります。
よろしくお願いいたします。


===================================================
Fatal error(E_USER_ERROR): DB処理でエラーが発生しました。
SQL: [INSERT INTO dtb_products_class(classcategory_id1,classcategory_id2,product_code,stock,price01,product_type_id,down_filename,down_realfilename,product_id,sale_limit,deliv_fee,point_rate,stock_unlimited,price02,creator_id,update_date,del_flg,create_date,product_class_id) SELECT $1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,CURRENT_TIMESTAMP,$16,CURRENT_TIMESTAMP,$17]
PlaceHolder: [array (
0 => '1933',
1 => '0',
2 => '',
3 => '',
4 => '',
5 => '1',
6 => '',
7 => '',
8 => '157',
9 => NULL,
10 => NULL,
11 => NULL,
12 => 0,
13 => 0,
14 => '2',
15 => 1,
16 => 15405,
)]
MDB2 Error: null value violates not-null constraint
_doQuery: [Error message: Could not execute statement]
[Last executed query: EXECUTE mdb2_statement_pgsql_*********** ('1933', '0', NULL, NULL, NULL, '1', NULL, NULL, '157', NULL, NULL, NULL, 0, 0, '2', 1, 15405)]

[Native message: ERROR: null value in column "point_rate" violates not-null constraint]
on [/home/*****/public_html/*******/data/class/SC_Query.php(1087)] from ***.***.***.***
login_id = *****(0)[*******]

/home/*****/public_html/******/keito/products/product_class.php(29): LC_Page_Admin_Products_ProductClass_Ex->process
/home/*****/public_html/*****/data/class_extends/page_extends/admin/products/LC_Page_Admin_Products_ProductClass_Ex.php(54): LC_Page_Admin_Products_ProductClass->process
/home/*****/public_html/*****/data/class/pages/admin/products/LC_Page_Admin_Products_ProductClass.php(61): LC_Page_Admin_Products_ProductClass->action
/home/*****/public_html/*****/data/class/pages/admin/products/LC_Page_Admin_Products_ProductClass.php(145): LC_Page_Admin_Products_ProductClass->registerProductClass
/home/*****/public_html/*****/data/class/pages/admin/products/LC_Page_Admin_Products_ProductClass.php(280): SC_Query->insert
/home/*****/public_html/*****/data/class/SC_Query.php(567): SC_Query->query
/home/*****/public_html/*****/data/class/SC_Query.php(865): SC_Query->execute
/home/*****/public_html/*****/data/class/SC_Query.php(1048): SC_Query->error
/home/*****/public_html/*****/data/class/SC_Query.php(1087): trigger_error
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