warning CS0642: Possible mistaken empty statement

I tried to follow Brackeys tutorials but it didn't go so well. I now get the message:
"Assets\PlayerCollision.cs(8.54): warning CS0642: Possible mistaken empty statement"
What does this mean and how can I improve my code?
This is my code:

using UnityEngine;
public class PlayerCollision : MonoBehaviour
{
void OnCollisionEnter(Collision collisionInfo)
{
if(collisionInfo.collider.name == "Obstacle");
{
Debug.Log("We hit an obstacle!");
}
}
}

I tried to let the console say "we hit an obstacle" when the player hits an obstacle but now it also says that the player hits an obstacle when it actualy hits the ground!
How do i fix this?
I hope someone knows the answer to my question.
Thank you.

 

I also require help with my code I am fairly new. Is this ok anyway to simplify this?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DestroyOutOfBounds : MonoBehaviour
{ private float topBound = 30;

// Update is called once per frame
void Update()
{
if (transform.position.z > topBound{

Destroy(gameObject);
}



}
}

 

If you have a question that isn't related to the original post, you should create a new thread to ask your question, rather than posting in the unrelated one.

Make sure to use code tags.

but, I can tell you that this sounds pretty reasonable to me . You check once per update if some simple condition has been met; you can't do much better than that.