Nullpointer Exception by OnCollisionEnter

Hi, I got a Nullpointer in OnCollisionEnter while colliding.
Here a sample:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Monotest : MonoBehaviour
4. {
5.     Rigidbody body;
6.  
7.     void Start()
8.     {
9.         body = GetComponent<Rigidbody>();
10.     }
11.  
12.     void OnCollisionEnter(Collision other)
13.     {
14.         if (body == null)
15.             print("why is it null?");
16.     }
17. }

While I collide with an other object the print message will be called 4 times. But why can the rigidbody be null? I initialize it on Start and never remove the rigidbody.

Using Unity version 2017.3.1

 

Do you have a rigidbody on the object that has this script on it?

 

Yes, and a collider, too.

 

Are you sure you're not using this script on multiple objects without rigidbodies?

 

Try it your self. The OnCollisionEnter Callback will be called 4 times. One time the body is not null the other it is.

EDIT: Never mind, restarted the editor and the error is away.