Capital gain on stocks in case of bonus shares and grandfathered price

Suppose the grandfathered price of a stock is Rs 1000 i.e. price on 31st Jan 2018 . Later the company gives 1:1 bonus and the price after bonus is also 1000 and the share quantity doubles. All shares are sold, in this case is any tax applicable on the bonus shares or we assume the same price and no LTCG.