# isNullRoundError

> **isNullRoundError**(`error`): `boolean`

Defined in: [packages/synapse-core/src/utils/wait-for-transaction-receipt.ts:23](https://github.com/FilOzone/synapse-sdk/blob/5989c4b03ed2fe4cf8b1ef29efe1d4ff1ad4c7bc/packages/synapse-core/src/utils/wait-for-transaction-receipt.ts#L23)

Whether the error is Lotus refusing to return a block for a Filecoin null round.

## Parameters

| Parameter | Type | Description |
| ------ | ------ | ------ |
| `error` | `unknown` | The error to check. |

## Returns

`boolean`

True when the error, or any error in its cause chain, is a null round error.