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WordPress 6.4 Crashing Sites Using A Popular Page Builder

Updating to WordPress 6.4 is causing sites to crash. So far it's limited to one page builder when legacy default themes are installed

WordPress 6.4 Crashing Websites

Many publishers and developers have been reporting that updating to WordPress 6.4 triggered a fatal error, bringing their websites down. A search for solutions began and within hours developers discovered a bug in the page builder they all used.


The developers of the page builder plugin patched the software and fixed what was causing the crashes.

See below for details.

Sites Crashing After Updating To 6.4

One of the first reports happened not long after WordPress 6.4, codenamed Shirley, was released.

A post in the private Dynamic WordPress Facebook group alerted members that their WordPress site crashed after updating.

One of the first clues to the problem was that all the crashed sites had the Oxygen page builder installed.

But that wasn’t the only thing users of the Oxygen page builder had in common.

SEO strategist and WordPress developer Brenda Malone (LinkedIn profile) shared that having legacy versions of the default theme, whether they’re installed or not, also caused Oxygen-based sites to crash.

Default themes are the ones that are named like Twenty Twenty One and Twenty Twenty Two.

Even though the old legacy default themes were deactivated, something about their presence while the Oxygen page builder was installed caused the site to crash.

Brenda Malone shared her observation with me:

“It apparently only happens if Oxygen is installed.”

The person who started the discussion in the private group related that he deleted all the older versions of the default theme and the site was restored.

Strange, right?

A solution proposed in the official Oxygen page builder User Group was to activate recovery mode, delete all old legacy themes then install a copy of the newest default theme, Twenty Twenty Four.

Why Did Updating WordPress 6.4 Cause Sites To Crash?

Someone in that Oxygen user group discovered and offered their theory that any active theme was loading their default style CSS, which was could be responsible for the issues.

He related that he deleted the CSS on their “oxygen bare minimum” theme and the problem went away.

As admin in the official Oxygen Facebook group posted that they are looking into what is causing Oxygen sites to crash.

They later posted the following:

“Oxygen 4.7.1 is now available as an update via the portal or the plugins page. This release resolves the issues reported with WordPress 6.4.

Please update Oxygen on your sites before updating to WordPress 6.4.”

Featured Image by Shutterstock/


Category SEO WordPress
SEJ STAFF Roger Montti Owner - at

I have 25 years hands-on experience in SEO and have kept on  top of the evolution of search every step ...

WordPress 6.4 Crashing Sites Using A Popular Page Builder

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