Error warning while upgrading from PS 1.4.9 to PS 1.5.4.1

[lovemyseo]

Hi while I am using local directory for prestashop upgrade I am getting this error 
 

SQL 1.5.0.10 1242 in INSERT INTO `ps_product_attribute_shop` (`id_product_attribute`, `id_shop`, `wholesale_price`, `price`, `ecotax`, `weight`, `unit_price_impact`, `default_on`, `minimal_quantity`, `available_date`) (SELECT `id_product_attribute`, (SELECT `value` FROM `ps_configuration` WHERE `name` = 'PS_SHOP_DEFAULT'), `wholesale_price`, `price`, `ecotax`, `weight`, `unit_price_impact`, `default_on`, `minimal_quantity`, `available_date` FROM `ps_product_attribute`): Subquery returns more than 1 row

Warning detected during upgrade.
 

Due to this I am unable to display few products combinations and prices in new version.

 

Any tips please