NullReferenceException about rigidbody tags

Question

I am constantly getting a NullRefenceException on one line

     if(collision.rigidbody.tag != "ground")

I don't know what's wrong with it. I have tried changing everything, but it just doesn't work. There is an object tagged "ground".

Answer 1

Best Answer

Answer by Peter G · Jul 24, 2011 at 03:31 AM

The NRE is probably not coming from the tag but rather collision reference or more likely rigidbody reference. If your object collides with an object without a rigidbody attached, then the reference will be null. And you can't check the property of a null reference.

Fix: add a conditional to make sure the object has a rigidbody.

 if(collision.rigidbody != null) {
     //do the rest of the stuff;
 }
 else {
     Debug.Log("The object we hit does not have a rigidbody attached.");
 }

Add comment · Share

NullReferenceException about rigidbody tags

1 Reply

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions