---
title: "Breaking: #82162 - Global error constants removed"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-82162"
source: "Changelog/9.0/Breaking-82162-GlobalErrorConstantsRemoved.rst"
typo3-version: "9.0"
typo3-major: 9
type: "breaking"
issue: 82162
forge: "https://forge.typo3.org/issues/82162"
tags: ["LocalConfiguration", "PHP-API", "FullyScanned"]
rendered: "2026-09-20T18:31:11+00:00"
---

# Breaking: #82162 - Global error constants removed {#breaking-82162}

See [forge#82162](https://forge.typo3.org/issues/82162)

## Description {#description}

Three error and logging related constants are no longer defined during TYPO3 core bootstrap:

-   `TYPO3_DLOG`
-   `TYPO3_ERROR_DLOG`
-   `TYPO3_EXCEPTION_DLOG`

Two error and logging related keys have been removed from `TYPO3_CONF_VARS`:

-   `$GLOBALS['TYPO3_CONF_VARS']['SYS']['enable_errorDLOG']`
-   `$GLOBALS['TYPO3_CONF_VARS']['SYS']['enable_exceptionDLOG']`

## Impact {#impact}

Accessing one of the constants in PHP will return the constants name as value
which is different to the former value and most likely breaks code depending on it.

## Affected Installations {#affected-installations}

The extension scanner of the install tool finds extensions affected by this change.
The install tool will automatically remove the `LocalConfiguration.php` settings
`TYPO3_CONF_VARS` if used.

## Migration {#migration}

Refactor code to not depend on these constants and `TYPO3_CONF_VARS` any longer,
there shouldn't be many use cases where extensions used these.