Change particle render material randomly.

Hi thank you for viewing this again :

First I have var splatters = Material[];

Then on collision it calls the following two lines....

splatMaterial = Random.Range(0,splatters.length);

Which works... untill I get to this... PS> The object list I drag for materials 0 - 5 all have a material set it does create this object and it has a child " particle system.... I' m lost...

I have this line of code

 gameobject.GetComponentInChildren(ParticleRenderer).renderer.material = splatters[splatMaterial];

//Why Does this not work..... it gives me ERROR :Object reference not set to an instance of an object " NULL "

//There is no null for this line of code game object would replaced with instantiate object I .. never get null when use regular object with material....