How to calculate the open loss for market orders when there is no ask price?

For a long-side market order, the open loss requires the best ask price to estimate the assuming price. However, what happens if there is no ask price yet?

Long order: assuming price = ask[0] * (1 + 0.05%)

Apologies, but I’m not following your description, could you give an example case to be more specific?

Sorry, the question was not clear.

In a long-side market order, the open loss of a long order is calculated as follows:

Open loss of long order = Number of Contracts * Absolute Value {min[0, direction of order * (mark price - assuming price)]}

The assuming price of a long order is calculated as:

Assuming price of long order = ask[0] * (1 + 0.05%)

However, if there is no ask price available, such as with the first long-side market order trader, the assuming price cannot be calculated. In this case, is there any alternative method for determining the assuming price can be used?