---
title: MARKLESS_TRY_BLOCK_TOGGLE_RERENDER
description: "Toggling an @if that holds a component re-renders the whole @try block."
sidebar: { hidden: true }
search: { keywords: ["TRY_BLOCK_TOGGLE_RERENDER","try block toggle rerender","markless error"] }
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---

**Warning** from the compiler, while it builds your `.tsrx` files.

## What happened

This `@if` sits inside `@try` and holds a component. When it toggles, Markless renders the whole `@try` block again, not only the `@if`.

Markless prints the message, the reason, and a suggestion:

```text
MARKLESS_TRY_BLOCK_TOGGLE_RERENDER: Toggling this <branchLabel> re-renders the whole @try block
Content with a component cannot be rebuilt from static parts and value slots, so the toggle falls back to re-rendering the whole @try block. That works, but it re-runs the component and replaces DOM the toggle did not touch.
Move the component outside the <branchLabel>, or keep the <branchLabel> content to plain elements, text, and state reads.
https://markless.dev/errors/MARKLESS_TRY_BLOCK_TOGGLE_RERENDER
```

Words in angle brackets change from case to case.

## How to fix it

Move the component out of the `@if`. Or keep the `@if` content to plain elements, text, and state reads.

If you accept the warning on purpose, put this comment on the line above it:

```tsrx
// markless-allow MARKLESS_TRY_BLOCK_TOGGLE_RERENDER: the reason you accept it
```

## Where it comes from

`@markless/compiler` raises this code. Source:

- [packages/compiler/src/passes/public-render/diagnostics.ts](https://github.com/compiled-run/markless/blob/main/packages/compiler/src/passes/public-render/diagnostics.ts)

Read [how to read a Markless error](/tooling/diagnostics), or go back to [all error codes](/errors).