WORDPRESS RELIABILITY GLOSSARY
Fatal Error
A catastrophic PHP execution failure that halts execution immediately.
Plain-English Explanation
When WordPress encounters code so broken or incompatible that it cannot continue running the website. Visitors see a critical error message instead of your pages.
Systems Engineering Definition
An unhandled Throwable, E_ERROR, or memory allocation ceiling that aborts the Zend Engine execution cycle before the WordPress template loader outputs headers.
Common Root Causes
- •PHP 8.x strict type mismatch on third-party plugin methods
- •Undefined function calls following an incomplete plugin upgrade
- •Exceeding the PHP memory_limit allocation (e.g. 128MB limit hit during image processing)
Autvy Automated Remediation
Autvy pre-allocates a 512KB heap reserve buffer in a boot-stage mu-plugin. If an E_ERROR occurs, Autvy captures the exact trace, disables the failing module via atomic symlink reversion in <24ms, and restores HTTP 200.
Automate protection against Fatal Error
Free 100-site private beta with instant remediation.