# Use with Promises Resolved with Null Values

If a promise is resolved with a `null` or `undefined` value, the fullfilled action will not include a payload property. This is because actions describe changes in state. Consider the following two actions:

```
// A
{
 type: 'ACTION`,
 meta: ...
}

// B
{
 type: 'ACTION'
 payload: null,
 meta: ...
}
```

Both actions describe the same change in state. This is why, when you resolve with `null` or `undefined`, the payload property is not included. It would be redundant to include it.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://pburtchaell.gitbook.io/redux-promise-middleware/guides/null-values.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
