[Resolved] Notice: ob_end_flush(): failed to send buffer of zlib output compression (0)

[ruxandra]

Hello,
After I updated the theme to its latest version today, I am having issues with various plugins, Elementor and Amelia.
1) Every time I update an element like the popup, I get server error on my wordpress dashboard.
as well as this notice on my site:
Notice: ob_end_flush(): failed to send buffer of zlib output compression (0) in /home/digit601/smoothdivision.com/wp-includes/functions.php on line 4339
I initially switched off the zlib output compression, but the issue didn’t get resolved.
I deactivated all plugins, issue still present. How do I resolve this please?

https://smoothdivision/info.php

[Tom]

Hi there,

The theme (and GPP) don’t use ob_end_flush() anywhere, so it’s possible that code is in one of your plugins (or a custom function).

What’s the server error you’re getting? When exactly is it happening? What kind of element are you updating? A GPP Element?

[ruxandra]

Yes,
I updated the GP theme today.
I was making a popup in elementor. When I click on the update button, on the dashboard I get server error message.
On the other hand, I deactivated ALL plugin and the issue persisted, the notice persisted.

[Tom]

What’s the server error message? Have you checked with Elementor support yet?

[ruxandra]

Oh, I’m sorry.It says “server error” on the WP dashboard.

[Tom]

Can you show me a screenshot?

You may want to report it to your hosting as well, as they’ll be able to take a look at your error logs.

[ruxandra]

I would’ve, but I don’t see how i can upload one here..

[Tom]

You can use a service like this: https://postimages.org/

[ruxandra]

https://i.postimg.cc/43YyqmMF/server-error.jpg

[Tom]

Have you reported it to Elementor yet? GP itself shouldn’t interfere with anything inside Elementor like this.

[ruxandra]

I did. I just didn’t understand why [Notice: ob_end_flush(): failed to send buffer of zlib output compression (0)] issue would still show after plugins deactivation, so i assumed it must be GP.

[Tom]

So that notice displays with all plugins turned off? What about GP Premium?

Are you using a child theme? If so, are there any custom functions in it?

[ruxandra]

The notice displayed with ALL plugins deactivated. I did not use a child theme. I just used elementor in top of GP.
I get two warnings about wp-rocket, then it goes away.
I don’t know, but it either has to be GP theme update or ELementor. But I don’t know why issues would persist if I deactivate all plugins.

This is what I get when I deactivated everything the second time:
Warning: include(/home/digit601/smoothdivision.com/wp-content/wp-rocket-config/smoothdivision.com.php): failed to open stream: No such file or directory in /home/digit601/smoothdivision.com/wp-content/plugins/wp-rocket/inc/classes/Buffer/class-config.php on line 124

Warning: include(): Failed opening ‘/home/digit601/smoothdivision.com/wp-content/wp-rocket-config/smoothdivision.com.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php72/root/usr/share/pear’) in /home/digit601/smoothdivision.com/wp-content/plugins/wp-rocket/inc/classes/Buffer/class-config.php on line 124
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Then it goes away.
I’m still waiting for the Elementor people to reply.
Thanks for your help.

[Tom]

I wonder if it’s an error in WP Rocket which is persisting even with the plugin deactivated. It seems like a fairly common WordPress error:
https://wordpress.org/support/topic/error-ob_end_flush-failed-to-send-buffer-of-zlib-output-compression/
https://wordpress.org/support/topic/plugin-problem-and-ob_end_flush-error/
https://wordpress.org/support/topic/failed-to-send-buffer-or-zlib-output-compression/

Does the error go away if you add this code to your site?:

remove_action( 'shutdown', 'wp_ob_end_flush_all', 1 );

Adding PHP: https://docs.generatepress.com/article/adding-php/

[ruxandra]

YES! Finally. I thought I added this already..THANK YOU Tom!!

[Author]

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