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---
lang: en
title: 'API docs: core.application.assertnotinprocess'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/core
permalink: /doc/en/lb4/apidocs.core.application.assertnotinprocess.html
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/core](./core.md) > [Application](./core.application.md) > [assertNotInProcess](./core.application.assertnotinprocess.md)
## Application.assertNotInProcess() method
Assert there is no other operation is in progress, i.e., the state is not `*ing`<!-- -->, such as `starting` or `stopping`<!-- -->.
<b>Signature:</b>
```typescript
protected assertNotInProcess(op: string): void;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| op | string | The operation name, such as 'boot', 'start', or 'stop' |
<b>Returns:</b>
void