Don't raycast if you click over a button

Hello, I have a scene where users can click over a terrain to set a position. This click launchs ray and gets the hit position over the terrain. This scene also have some buttons on which users can interact. My problem is that, if users interact with the buttons , the raycast also launchs and it hit the terrain modifying the position. How can I avoid the raycast to be launched if I interact with a button?

Thanks!

 

https://answers.unity.com/questions/1410936/how-to-prevent-a-ui-element-from-clicking-the-game.html

 

It works like a charm! Thanks!