Daily P&L: Price at midnight is missing for one or more contracts

Next to the Daily P&L indicator, I see a red hazard sign with an exclamation point on it. If I hover over it with the mouse, I see the pop-up below. How do I tell what holding is missing pricing?

 

Check the bid/ask on all holdings.
If missing either bid or ask then it's missing midpoint.

 

Good idea. I'll enable those columns and check.

 

Thanks BKR88, I tried your suggestion and looks like it's due to some Pfizer derivative positions (PFE & PFE1) where the derivatives are not tradable due to some spin-off.

 

https://seekingalpha.com/news/3636507-pfizers-upjohn-spinoff-completes-merger-mylan-to-form-viatris