A classic of the genre: you clicked “Update,” went to make coffee, and came back to a blank white page or a wall of red text you really didn’t want to see this morning. Take a breath — this is one of the most common, and most fixable, problems in WordPress, as long as you work methodically instead of panicking.
First: don’t click anything else
The first instinct is often to keep clicking — maybe one more update will fix it? No. Every additional change at this point makes it harder to later figure out what actually broke the site. Pause for a moment.
Step 1: Check what’s on screen
- A blank white page with no text at all (the “white screen of death”) — usually a plugin or theme conflict with the new WordPress version, sometimes an exceeded PHP memory limit.
- A red/orange error message with a file name — actually good news, since WordPress is essentially telling you what’s wrong. Pay attention to the plugin or theme name in the message.
- The site partly works but looks “broken” — usually a theme issue or a CSS/JS conflict between plugins.
Step 2: Turn on debug mode if the message is unclear
Adding the line define('WP_DEBUG', true); to your wp-config.php file (temporarily — turn it off afterward) will show you a full, technical description of the error instead of a generic white page. It’s like turning on a flashlight in a dark room instead of feeling around blindly.
Step 3: Disable plugins one by one via FTP or the file manager
If you suspect a plugin but can’t access the admin panel (because the site is down), log in via FTP or your hosting panel’s file manager and rename the folder for a given plugin in wp-content/plugins/ — that automatically deactivates it without needing to log into WordPress. Do this one plugin at a time, checking the site after each change, to pinpoint exactly which one is the culprit.
Step 4: If it’s the theme — switch to the default one
Renaming the active theme’s folder (the same trick as with plugins) makes WordPress automatically fall back to one of the default themes. If the site starts working, you know the problem is in the theme, not a plugin.
Step 5: If nothing helps — restore from backup
This is where it all comes down to one thing: if you don’t have a backup from before the update, this step isn’t possible. This is the best moment (after fixing the current issue) to set up automatic, regular backups — most hosting providers offer this in their panel, often for free.
How to avoid this next time
- Update plugins and WordPress one at a time, not all at once with a single “Update all” click — it’s much easier to spot the culprit if something goes wrong.
- Do it on a
stagingenvironment, if your hosting offers one, instead of directly on production. - Always have a fresh backup before any update — it’s literally a few clicks, and it saves you evenings spent digging through files over
FTP.
Site won’t come back up after an update, and you don’t have time to dig through files? Tell me what’s on your screen — I’ll help sort it out.