SharePoint list conditional formatting, hide button

Hi All,

I am trying to look if a conditional formatting for a button on a SharePoint list is available. The current SharePoint list that I am working on has a column that contains button wherein this button when clicked will update the row and put an entry on another field. The button should only appear if the entry on the field for that row is null. I want the button hidden whenever the field entry is not null.  

Thank you!