Manual entry form closing price should accept zero

Currently when I am trying to enter a trade in the manual entry form, it is expecting me to put in a price in the closing price field to calculate the profit. There are times when a trade will go to 0 and when I am doing spreads, I would let it expire worthless, which means my exit price is 0 most of the times. This field should not be mandated or should be able to accept 0 as an input.