GameObject null after SetParent()

Questions & Answers
1

So basically I have a Collision.
In one of the colliding objects, I save a reference to the other and at the same time, I set its parent to the same collider.

void OnTriggerEnter2D(Collider2D collision){
	saveObject = collision.transform.gameObject;
	saveObject.SetParent(transform);
}

The second time I enter OnTrigger Enter2D with another object, saveObject is null.
If I remove, SetParent(), the object is still the collision-object as expected.

Basically, I want to remove the previous object, before adding the new one.

Can anybody explain why this happens, and how to circumvent it?

2

Why do you want to set a parent? Doing this makes sense that it would return you a null gameObject. Either try to use a different method or reassign the gameObjcet in your code.