Ecshop Vietnam Application Error

The application could not run because of the following error:

Type: E_NOTICE [8]

Message: Undefined index: market_price in /home/thanh/domains/tiktak.vn/public_html/includes/lib_goods.php

Line: 550

Stack trace:

#0 /home/thanh/domains/tiktak.vn/public_html/includes/lib_goods.php(550): ErrorHandler->handleError(8, 'Undefined index...', '/home/thanh/dom...', 550, Array)
#1 /home/thanh/domains/tiktak.vn/public_html/modules/goods.php(53): get_goods_info(44)
#2 /home/thanh/domains/tiktak.vn/public_html/index.php(27): include_once('/home/thanh/dom...')
#3 {main}