# Fix PHP Errors – Fatal Error, Memory Exhausted & Plesk

PHP fatal error or "Allowed memory size exhausted"? Plesk error.log, memory_limit, faulty plugin – webspace PHP troubleshooting step by step.

**Quick answer:** PHP errors: **read error log**, **increase memory_limit** (256M–512M), disable faulty **plugin/theme** and check PHP version in Plesk.

**If you landed here:** Site shows PHP error message, white screen with fatal error or HTTP 500 after update.

## Error → fix

ErrorFix

Fatal error in plugin.phpDisable plugin via FTP

Memory exhaustedmemory_limit 512M

Parse errorSwitch PHP version (8.1/8.2)

## Related

- [White screen / HTTP 500](/en/webspace/weisse-seite-500-fehler)
- [502 Bad Gateway](/en/webspace/502-bad-gateway)
- [PHP versions](/en/webspace/web-technologien/php-versions-and-configuration)
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