rsnext/errors/threw-undefined.md
JJ Kasper 57a87050e7
Add util for normalizing errors (#33159)
* JSON.stringify generic errors

* Add util for normalizing errors

* lint-fix

* Add better error for null case as well

Co-authored-by: Michael Ozeryansky <mozeryansky@users.noreply.github.com>
2022-01-11 14:40:03 -06:00

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Markdown

# Threw `undefined`/`null`
#### Why This Error Occurred
Somewhere in your code you `throw` an `undefined` or `null` value. Since this isn't a valid error there isn't a stack trace. We show this error instead to let you know what to look for.
```js
function getData() {
let error
throw error
}
function Page() {
const error = data?.error || null
throw error
}
```
#### Possible Ways to Fix It
Look in your pages and find where an error could be throwing `undefined` or `null` values and ensure `new Error()` is used instead.