---
title: "Breaking: #74533 - Throw exception if user function does not exist"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-74533"
source: "Changelog/9.0/Breaking-74533-ThrowExceptionIfUserFunctionDoesNotExist.rst"
typo3-version: "9.0"
typo3-major: 9
type: "breaking"
issue: 74533
forge: "https://forge.typo3.org/issues/74533"
tags: ["PHP-API", "PartiallyScanned"]
rendered: "2026-09-20T18:31:11+00:00"
---

# Breaking: #74533 - Throw exception if user function does not exist {#breaking-74533}

See [forge#74533](https://forge.typo3.org/issues/74533)

## Description {#description}

`GeneralUtility::callUserFunction()` does now always throw an exception if the passed
user function does not exist or is not callable. The parameter `$errorMode` has been removed,
exceptions are now always thrown. The method should not be called with more than three arguments.

## Impact {#impact}

Calling a not existing or uncallable user function leads to an exception, breaking the page output.

## Affected Installations {#affected-installations}

All TYPO3 installations are affected.

## Migration {#migration}

Remove or fix invalid `userFunc` calls registered in TypoScript and/or `ext_localconf.php`. Catch exceptions properly
with try/catch.