Fix 500 Internal Server Error in WordPress Quickly and Easily

A 500 Internal Server Error in WordPress usually means something went wrong on the server, often due to faulty plugins, themes, or corrupted .htaccess files. To fix it, disable plugins and themes by renaming their folders via FTP and reset the .htaccess file to default.

Why This Happens

The 500 Internal Server Error in WordPress happens when the server cannot complete your request due to a problem in the website's code or configuration. Common causes include a corrupted .htaccess file, plugin conflicts, theme errors, or exhausted PHP memory limits.

For example, a plugin with bad code can cause the server to fail and show this error.

php

<?php
// Example of a plugin causing a fatal error
function faulty_plugin_function() {
    undefined_function_call(); // This function does not exist
}
add_action('init', 'faulty_plugin_function');
?>

Output

Fatal error: Uncaught Error: Call to undefined function undefined_function_call() in /wp-content/plugins/faulty-plugin/plugin.php on line 3

The Fix

To fix the 500 error, first disable all plugins by renaming the plugins folder via FTP or your hosting file manager. Then check if the site loads. If it does, rename the folder back and activate plugins one by one to find the faulty one.

Also, rename the .htaccess file to reset it, then go to WordPress dashboard > Settings > Permalinks and save to generate a new .htaccess.

If the problem persists, increase PHP memory limit by adding define('WP_MEMORY_LIMIT', '256M'); to wp-config.php.

php

<?php
// Corrected plugin code without errors
function fixed_plugin_function() {
    // Safe code here
}
add_action('init', 'fixed_plugin_function');
?>

Output

No errors, site loads normally

Prevention

To avoid 500 errors in the future, always keep WordPress, themes, and plugins updated. Use plugins from trusted sources only. Regularly back up your site and test new plugins or themes on a staging site before applying to live.

Enable error logging in WordPress by adding define('WP_DEBUG', true); and define('WP_DEBUG_LOG', true); in wp-config.php to catch issues early.

Related Errors

Other common WordPress errors include:

• White Screen of Death: Usually caused by PHP errors or memory limits.
• 403 Forbidden: Permission issues on files or folders.
• 404 Not Found: Broken links or missing pages.

Fixes often involve checking file permissions, disabling plugins, or resetting permalinks.

Key Takeaways

Rename the plugins folder to disable all plugins and identify the faulty one causing the 500 error.

Reset the .htaccess file by renaming it and saving permalinks to fix corrupted rewrite rules.

Increase PHP memory limit in wp-config.php if memory exhaustion causes the error.

Keep WordPress, themes, and plugins updated and use error logging to catch issues early.

Test new plugins or themes on a staging site before applying changes to your live site.