# 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
```
#### 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.