WordPress 500エラー：ウェブサイトがパニックに陥ったとき

Your ワードプレス site was fine a minute ago.
You refreshed the page.
And suddenly—boom 💥—500 Internal Server Error.

No explanation.
No apology.
Just a cold, confusing message that basically says:

“Something went wrong.
Don’t ask me what.”

If you’ve ever stared at this error like it personally betrayed you, congratulations—you’re officially a WordPress user.

Let’s break down what this error really means, why it happens, and how to fix it without losing your sanity (or your site).

First Things First: What Is a 500 Internal Server Error?

A 500 error is WordPress saying:

“I tried.
Something failed.
I don’t know which thing.
Good luck.”

It’s a server-side error, not a theme issue, not a typo, not Mercury in retrograde.
The server simply couldn’t process the request.

Annoying? Yes.
Common? Extremely.
Fixable? Absolutely.

Most Common Reasons WordPress Throws a 500 Error

Think of this error as WordPress having a bad day.
Here are the usual suspects:

1. A Plugin Woke Up and Chose Violence

Plugins are amazing—until one update decides to break everything.

What to do:

• Disable all plugins
• Reload the site
• Re-enable them one by one

When the error comes back, you’ve found the troublemaker.

(Pro tip: It’s usually the one that said “minor update”.)

2. Your Theme Is Having an Existential Crisis

Custom code, a broken update, or a half-edited functions.php file can crash the entire site.

Quick test:

• Switch to a default theme (like Twenty Twenty-Four)
• If the site loads, your theme is the issue—not WordPress

3. The .htaccess File Is Not Your Friend Today

A corrupted .htaccess file can silently destroy your website dreams.

Fix it:

• Rename .htaccess への .htaccess_old
• Refresh your site
• Go to Settings → Permalinks and click Save

WordPress will generate a clean one for you.

4. PHP Memory Limit: The Silent Killer

Your site is hungry.
Your server says: “No more memory.”

Solution:
Increase PHP memory limit in wp-config.php:

define('WP_MEMORY_LIMIT', '256M');

Because 64MB in 2025 is just disrespectful.

5. Server or Hosting Issues (Yes, It Happens)

Sometimes it’s not you.
It’s the server.

Shared hosting overload, misconfigured PHP version, or a temporary crash can all trigger a 500 error.

If everything else fails:

• Check server logs
• Contact your hosting provider
• Or consider upgrading before your site revolts again

How to Debug Like a Calm, Responsible Adult

Enable WordPress debug mode:

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);

This gives you actual error messages instead of WordPress shrugging at you.

Knowledge = power.

Why 500 Errors Hurt More Than You Think

A 500 error doesn’t just look bad—it:

• Breaks SEO indexing
• Kills conversions
• Destroys user trust
• Makes Google quietly judge you

If your site goes down during ads, promotions, or peak traffic…
That’s real money disappearing.

Final Thoughts (And a Friendly Reality Check)

Most 500 Internal Server Errors are fixable in minutes—if you know where to look.

But if this keeps happening?
If updates feel risky?
If your site breaks every time you touch it?

That’s not “normal WordPress behavior.”
That’s a structure problem.

And that’s where professionals come in.

Need a Stable WordPress Site That Doesn’t Randomly Explode?

で エアサン, we specialize in:

• Cross-border business websites
• ワードプレス & Shopify site design
• Performance optimization & stability
• SEO-friendly structures built for growth

We don’t just make sites look good—we make sure they stay online, convert, and scale globally.

If you’re tired of surprise errors and midnight panic refreshes,
follow エアサン or reach out when you’re ready to build something solid.

Your server will thank you. 😌