# Sandbox.SuppressNullKeyWarningAttribute

When applied to a member with `T:System.Collections.Generic.Dictionary`2` or `T:System.Collections.Generic.HashSet`1` type,
don't warn if the key of an item becomes null during a hotload because a type is removed. You should
only use this attribute if you're sure that it's safe to quietly remove entries.

- Kind: attribute
- Namespace: `Sandbox`
- Assembly: `Sandbox.System`
- Modifiers: sealed

## Constructors

- [`SuppressNullKeyWarningAttribute`](/api/Sandbox.SuppressNullKeyWarningAttribute/.ctor)