Prestashop 1.7.7 ContextErrorException Notice: Undefined index: attribute_price

[kashifmurtaza]

I have installed fresh Prestashop version 1.7.7 and add some products/categories. When I have enabled debug mode.. I see errors on front office, like given below: 

(1/1) ContextErrorException

Notice: Undefined index: attribute_price

in Product.php line 3418

at ProductCore::priceCalculation(1, 21, 0, 1, 0, '60000', 1, 3, 1, false, 6, false, true, true, array(), true, 3, true, null, 0, null)in Product.php line 3269

at ProductCore::getPriceStatic(21, false, 0, 6, null, false, true, 1)in Product.php line 4970

at ProductCore::getProductProperties(2, array('

[kashifmurtaza]