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Documentation for LoopBack 4
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lang: en
title: 'API docs: repository.isinvalidrelationerror'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.isinvalidrelationerror.html
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[Home](./index.md) > [@loopback/repository](./repository.md) > [isInvalidRelationError](./repository.isinvalidrelationerror.md)
## isInvalidRelationError() function
<b>Signature:</b>
```typescript
export declare function isInvalidRelationError(e: any): e is InvalidRelationError<any>;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| e | <code>any</code> | |
<b>Returns:</b>
`e is InvalidRelationError<any>`