Grasshopper python: Bestway to stop a datatree as an input

Hi Everyone,

I want to put a check in my grasshopper python component so that if what you see in the picture below happens - that is a datatree is entered as an input to the component.

The component will identify that its a datatree and then raise an error.

Essentially I dont want datatrees as an input in my component. So the question is what would be the best way to code a check so that I could raise an error if a datatree is used as an input?