# Null

> A special "null" ArchetypeChunk that you can use to test whether ArchetypeChunk instances are valid.

## Definition

* **Type:** Property
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

```csharp
public static ArchetypeChunk Null { get; }
```

### Remarks

An ArchetypeChunk struct that refers to a chunk of memory that has been freed will be equal to this "null" ArchetypeChunk instance.