500 error during bulk optimization

Hello @igortitarenko and thanks for reporting this.

The error is a bit odd because it could show up when a specific thumbnail is somehow sent for optimization, but without being present in the WordPress metadata. But that’s how our plugin builds the list of images to sent for optimization, so it’s surely very odd.

In order to debug this further, we need a bit more details from you:

• can you please send us the list of active plugins and the active theme? Ideally, we could use the entire debug information found in Tools -> Site Health -> Info
• can you check the console and look above the error you mentioned? You should see which image was send for optimization and then check to see if there is anything weird going on with that image (is it a missing image, or does it have more or less thumbnails than it should, etc.?).

We’ll do our best to reproduce the same error on our test sites. Any additional information that you can send us would be really helpful!

Thank you!

Hi @petredobrescu

I cannot see in the Console which image is sent for optimization.

POST https://example.com/wp-admin/admin-ajax.php[HTTP/2 500 Internal Server Error 656ms]

Worker.js reporting issue [object Response] shortpixel-worker.js:104:15

Error without item – 500 Internal Server Error(undefined) screen-bulk.js:637:12

updating Data : error

Object { message: “<div class=\”\”>500 Internal Server Error(undefined)</div>” } undefined screen-bulk.js:526:15

Error: 500 Internal Server Error shortpixel-processor.js:573:19

Stop Processing #242 shortpixel-processor.js:246:17

Shutting down Worker

Themes: Name Jupiter (jupiter2) Version 6.10.1

Plugins:

Asset CleanUp: Page Speed Booster Version 1.3.8.9 by Gabe Livan | Auto-updates disabled
Classic Editor Version 1.6.2 by WordPress Contributors | Auto-updates enabled
Easy Table of Contents Version 2.0.41 by Magazine3 | Auto-updates enabled
ECO Custom Version 1.0 | Auto-updates disabled
Fixed Widget Version 6.2.3 by Thomas Maier, Max Bond | Auto-updates enabled
FormCraft Version 3.2.23 by nCrafts | Auto-updates enabled
Jupiter Core Version 1.0.4 by Artbees | Auto-updates enabled
Jupiter Donut Version 1.4.2 by Artbees | Auto-updates enabled
MC4WP: Mailchimp for WordPress Version 4.8.12 by ibericode | Auto-updates enabled
Post Slider For Visual Composer Version 1.1 by Nasir | Auto-updates enabled
Redirection Version 5.3.6 by John Godley | Auto-updates enabled
ShortPixel Image Optimizer Version 5.1.6 by ShortPixel | Auto-updates enabled
TablePress Version 2.0.2 by Tobias B?thge | Auto-updates enabled
Thrive Architect Version 2.6.10 by Thrive Themes (Latest version: 3.16.2) | Auto-updates enabled
W3 Total Cache Version 2.2.9 by BoldGrid | Auto-updates enabled
Wordfence Security Version 7.8.2 by Wordfence | Auto-updates enabled
WP-Sweep Version 1.1.5 by Lester ‘GaMerZ’ Chan | Auto-updates enabled
WPBakery Page Builder (Modified Version) Version 6.10.0 by Michael M – WPBakery.com | Auto-updates enabled
WPML Multilingual CMS Version 4.5.14 by OnTheGoSystems | Auto-updates enabled
Yoast SEO Version 19.13 by Team Yoast | Auto-updates enabled

Right. So, I went into the plugin options, cleared the queue and started bulk optimization again. It works for now.

Thanks for the details @igortitarenko.

I see that you are also using WPML, but without the Media Translation extension plugin. Are you uploading all images to the same language? Because without the WPML Media plugin, all sort of situations may appear.

I’m glad the bulk is running now. However, if there’s an image with some issues, there’s a high change that it will get stuck again.

I’ll mark the ticket as Resolved for now and please let us know if the error comes back!

@petredobrescu Could you please elaborate on “all sort of situations may appear”? Is it related to WPML alone or to ShortPixel combined with WMPL?

We’ve seen many situations when things became at least weird when WPML was used, mostly from what’s stored in the DB perspective. And looking at the error you reported, there is a change that it is related to WPML, especially if you had operations like restoring from the backup, re-optimizing, while WPML was turned off. Or even image optimizations done with and without WPML active.

Please tell me if you’re still getting that error or the bulk finished successfully this time.

Thanks!

I’m not getting that error anymore and the bulk was finished successfully this time.

That’s great news @igortitarenko, thanks for the confirmation!

We have actually been able to identify a potential cause of this error and it shows up only in certain situations (most likely when there are multiple PNG file processed more or less at the same time and they also have thumbnails that are not listed in the WordPress metadata).

We’ll include a permanent fix for this in the upcoming version 5.2.0.

Please let us know if you have any other questions!