Fix WordPress Critical Errors, Keep Site Stable

If you run a WordPress website long enough, chances are you’ll eventually encounter a message that every site owner dreads:

“There has been a critical error on this website.”

This WordPress critical error often appears without warning. One moment your site is working fine, and the next, both the frontend and admin dashboard become inaccessible. For business owners, bloggers, or cross-border eCommerce brands, this can be stressful — especially when the website plays a key role in sales, leads, or brand trust.

The good news is this:
a WordPress critical error is usually fixable, even if you’re not a developer.

In this guide, we’ll break down what a WordPress critical error really means, why it happens, and how to fix it step by step — in plain English. We’ll also share best practices to prevent it from happening again as your site grows.

What Is a WordPress Critical Error?

A WordPress critical error means that PHP — the language WordPress is built on — encountered a fatal problem that stopped the site from running.

Instead of showing visitors a broken page or technical error logs, WordPress now displays a user-friendly message to protect sensitive information.

Behind the scenes, however, something serious has gone wrong.

Most commonly, a WordPress critical error is caused by:

• A faulty plugin
• A broken theme update
• Incompatible PHP versions
• Exhausted memory limits
• Corrupted core files

Understanding the cause is the key to fixing it properly.

Why WordPress Shows a “Critical Error” Message

WordPress introduced this message to replace older “white screen of death” issues. While it looks vague, it’s actually a safety mechanism.

When WordPress detects a fatal error that could expose system details or crash the site entirely, it halts execution and shows the critical error notice instead.

In many cases, WordPress will also send an email to the site administrator with a debug link, which can help identify the exact file or plugin causing the problem.

Common Causes of a WordPress Critical Error

Let’s look at the most frequent reasons this error appears.

1. Plugin Conflicts

Plugins extend WordPress functionality, but they’re also the #1 source of critical errors.

A plugin can cause issues when:

• It’s outdated
• It conflicts with another plugin
• It’s incompatible with your WordPress or PHP version

One bad update is often enough to bring down the entire site.

2. Theme Problems

Themes control how your site looks and often include custom functions.

A critical error can occur if:

• A theme update contains broken code
• Custom code was added incorrectly
• The theme is not compatible with your WordPress version

This is especially common with heavily customized or poorly maintained themes.

3. PHP Version Incompatibility

Your hosting server runs a specific PHP version. If your WordPress core, theme, or plugins aren’t compatible with it, a fatal error can occur.

For example:

• Older plugins may break on newer PHP versions
• Newer themes may fail on outdated PHP environments

4. Memory Limit Exhaustion

WordPress websites consume memory when running plugins, themes, and scripts.

If your site exceeds the allocated memory limit, WordPress may crash and trigger a critical error.

This is common on:

• Shared hosting
• Growing eCommerce sites
• Multi-language or media-heavy websites

5. Corrupted WordPress Core Files

Files can become corrupted due to:

• Failed updates
• Malware
• Improper file permissions
• Incomplete file uploads

When core WordPress files break, the system may no longer function correctly.

Step-by-Step: How to Fix a WordPress Critical Error

Now let’s walk through the most effective ways to fix a WordPress critical error, starting with the easiest and safest options.

Step 1: Check Your Email for the Recovery Link

WordPress often sends an email to the admin address with details about the error.

Look for:

• The plugin or theme name mentioned
• A recovery mode login link

If available, use this link to access your dashboard and deactivate the problematic component.

Step 2: Enable WordPress Debug Mode

If the email doesn’t help, you can manually enable debugging.

This allows WordPress to show error details instead of the generic critical error message.

By reviewing the error output, you can often identify:

• The exact file causing the issue
• Whether it’s plugin- or theme-related

Debugging is one of the fastest ways to pinpoint the source of a WordPress critical error.

Step 3: Disable All Plugins

If you can’t access the admin panel, use FTP or your hosting file manager.

1. Go to /wp-content/
2. Rename the plugins folder to something like plugins_old

This disables all plugins at once.

If the site loads again, the issue is plugin-related.
Rename the folder back and activate plugins one by one until the error returns.

Step 4: Switch to a Default Theme

If plugins aren’t the problem, the theme might be.

Using FTP or file manager:

• Rename your active theme folder
• WordPress will automatically switch to a default theme

If the site works afterward, your theme is causing the WordPress critical error.

Step 5: Increase the PHP Memory Limit

Many critical errors are caused by memory exhaustion.

You can increase memory limits by:

• Editing wp-config.php
• Adjusting PHP settings in your hosting panel

This is especially important for:

• WooCommerce stores
• Elementor or page-builder sites
• Multi-language websites

Step 6: Check PHP Version Compatibility

Try switching PHP versions in your hosting dashboard.

If your site recently updated:

• Downgrading PHP can restore compatibility
• Upgrading may fix legacy conflicts

Always test carefully — PHP version changes affect the entire site.

Step 7: Reinstall WordPress Core Files

If nothing else works, your WordPress core files may be damaged.

Reinstalling WordPress core:

• Does NOT affect content
• Does NOT remove plugins or themes
• Restores missing or corrupted system files

This step often resolves stubborn WordPress critical error issues.

How to Prevent WordPress Critical Errors in the Future

Fixing the error is only half the solution. Preventing it is even more important.

Here are best practices we recommend for long-term stability.

Always Update Carefully

Never update everything at once.

Before updating:

• Create a full backup
• Test updates on a staging site if possible

This is especially critical for business and cross-border eCommerce websites.

Use Reliable Plugins and Themes

Avoid:

• Abandoned plugins
• Themes with no recent updates
• Unknown developers

Quality code dramatically reduces the risk of WordPress critical errors.

Match PHP Versions Strategically

Don’t blindly upgrade PHP.

Instead:

• Check compatibility first
• Upgrade gradually
• Monitor site behavior after changes

Optimize Hosting for Growth

Many critical errors happen simply because the site outgrows its hosting.

If your website is expanding internationally, adding languages, or handling more traffic, your infrastructure must scale accordingly.

Work With Professionals When Needed

When WordPress becomes part of your business operations, downtime is expensive.

At that stage, relying on trial-and-error fixes is risky.

Final Thoughts: When a Critical Error Is a Wake-Up Call

A WordPress critical error is frustrating, but it’s also informative.

It often signals:

• Growing technical complexity
• Inadequate hosting
• Outdated architecture
• Or the need for professional optimization

If your website supports international business, cross-border eCommerce, or brand growth, stability is not optional — it’s foundational.

How AIRSANG Can Help

At AIRSANG, we specialize in cross-border website design, WordPress optimization, and scalable site architecture.

We don’t just fix WordPress critical errors —
we help brands prevent them altogether by building:

• Clean, stable WordPress structures
• Performance-optimized themes
• Plugin-efficient systems
• Websites designed to grow globally without breaking

If you’re dealing with recurring WordPress critical error issues — or want to build a site that won’t run into them as your business scales — AIRSANG is here to help.

Your website should support your growth, not interrupt it.