x cart - Xcart 4.7.5 : All products renamed as restored_product and corrupt the price and other values -

i working on ecommerce site using xcart 4.7.5. per client requirement wrote custom modules csv uploads of products.everything working fine. products renamed restored_products , corrupt product database values. dont know happened.i confused here.

found it. beacause of function func_delete_product($productid).here if productis null or empty erase details product_lng table. added validations , works fine.