Fatal Error in autoptimizeImages.php on PHP 8.3

Resolved HighKay
(@hlorenz)

2 months, 1 week ago
Hi,

I’m experiencing a recurring PHP fatal error on multiple WordPress sites running Autoptimize with PHP 8.3. The error appears in the server error log during high crawler traffic (typically at night) and results in HTTP 500 responses.

Error message:
```
PHP Fatal error: Uncaught Error: Using $this when not in object context in autoptimize/classes/autoptimizeImages.php on line 1061

#0 autoptimizeImages.php(912): autoptimizeImages::create_img_preload_tag()
#1 autoptimizeImages->filter_lazyload_images()
```
Environment:
- PHP 8.3
- WordPress (latest)
- Autoptimize (latest)
- Hosting: LiteSpeed server
Observations:
- The error occurs in the image optimization / lazy load functionality
- It does not occur consistently – it seems triggered by concurrent requests
- Temporarily disabling and re-enabling the image optimization feature does not resolve the issue permanently
- The error affects multiple sites with the same setup
Has anyone else encountered this? Is there a known fix or workaround short of permanently disabling image optimization?

Thanks

Viewing 5 replies - 1 through 5 (of 5 total)

Plugin Author Optimizing Matters
(@optimizingmatters)

2 months, 1 week ago

not a real solution, but as a workaround can you try if disabling the “metabox” option near the bottom of the main settings or (better) to find all pages which have LCP preloads in the “autoptimize this page” metabox being filled in the metabox of the individual page) and remove them there?

re. the root cause; I’ll look into that! 🙂

Plugin Author Optimizing Matters
(@optimizingmatters)

2 months, 1 week ago

OK, I *think* I know what the problem is, but (a) I can’t reproduce it (also PHP 8.3 on my development environment) and (b) it’s not logical the error would not always happen, as opposed to only under heavy load?

Anyway, could you make the following small (but in the end logical) change to wp-content/plugins/autoptimize/classes/autoptimizeImages.php on line 1042 change

public static function create_img_preload_tag( $tag ) {
into
public function create_img_preload_tag( $tag ) {

because indeed in a static function you can’t call $this, my bad!

looking forward to your feedback 🙂

frank
Thread Starter HighKay
(@hlorenz)

2 months, 1 week ago
Hi Frank,

I just applied the code change to my websites.

We’ll have to wait until tomorrow, to see if it worked, since I can’t find Live error log. Only the one from tonight.

I’ll tell you tomorrow & thanks for the ultra-quick response!

Thanks

Heike
- This reply was modified 2 months, 1 week ago by HighKay.
Plugin Author Optimizing Matters
(@optimizingmatters)

2 months ago

pushing out the fix now as version 3.1.15.1, sorry for the inconvenience!

frank

Thread Starter HighKay
(@hlorenz)

2 months ago

Thanks 🙂

Viewing 5 replies - 1 through 5 (of 5 total)

You must be logged in to reply to this topic.