Background of the issue:
I found an error on the logs and need to understand why it's happening. We found this error on the error log: 2025/07/04 14:54:15 [error] 11480#11480: *479993 FastCGI sent in stderr: "PHP message: objectcache.notice: The cache key `product_cat` is incompatible with prefetching and the group `WPML_Slug_Translation_Records::taxonomy` should be added to the list of non-prefetchable groups. For more information see: hidden link; PHP message: objectcache.notice: The cache key `product_tag` is incompatible with prefetching and the group `WPML_Slug_Translation_Records::taxonomy` should be added to the list of non-prefetchable groups. For more information see: hidden link" while reading response header from upstream, client: 66.249.68.39, server: woocommerce-245274-4383778.cloudwaysapps.com, request: "GET /wp-content/uploads/breeze/facebook/fbevents.js HTTP/1.1", upstream: "hidden link:", host: "www.pro-carbonracing.com", referrer: "hidden link". We need to know how important this is and how to fix it. I don't know if this is affecting other parts of the website.
Symptoms:
The error log shows that the cache key `product_cat` and `product_tag` are incompatible with prefetching, and the group `WPML_Slug_Translation_Records::taxonomy` should be added to the list of non-prefetchable groups.
Questions:
How important is this error?
How can I fix this issue?
Languages: English (English )German (Deutsch )French (Français )
Timezone: Europe/Zagreb (GMT+02:00)
Hi,
This doesn’t usually break the site, but it may affect performance or cache consistency for things like translated slugs, especially in WooCommerce taxonomies (`product_cat`, `product_tag`).
To help clarify the situation:
1. Have you added or customized any cache groups in your object cache configuration?
2. Are you using Redis or Memcached with Object Cache Pro?
3. Did you recently make changes to how caching is handled for taxonomies or WPML-related data?
If this cache group is not excluded from prefetching, you can resolve the warning by adding it to the `non-prefetchable-groups` list as described here: hidden link
Let me know what your current caching setup looks like, and I can help guide you further.
We're encountering website timeouts and plugin disabling when adding product category translations. This issue appears to be directly tied to the translation process.
Our current configuration uses Redis with Object Cache Pro and WP Rocket (preload active, no exclusions). We haven't recently adjusted cache settings or groups.
Could you advise on adding an exclusion to address this, if you believe it's the cause?
Does it help? Also, when you encounter timeouts during the translation, can you share server and WordPress debug logs that show at that time?
To further confirm whether caching is the root cause, you could try temporarily disabling Object Cache Pro (or Redis object caching) while performing a product category translation. If the process completes without timeouts or errors, that strongly points to cache interference.
I think the error is still showing
[08-Jul-2025 15:39:14 UTC] objectcache.notice: The cache key `product_cat` is incompatible with prefetching and the group `WPML_Slug_Translation_Records::taxonomy` should be added to the list of non-prefetchable groups. For more information see: hidden link
[08-Jul-2025 15:39:14 UTC] objectcache.notice: The cache key `product_tag` is incompatible with prefetching and the group `WPML_Slug_Translation_Records::taxonomy` should be added to the list of non-prefetchable groups. For more information see: hidden link
I will sent you the logs as soon as the error presents itself. I requested my client to try again and he will let me know the times for it
The error is presisting and here are the details
[11-Jul-2025 10:31:29 UTC] objectcache.notice: The cache key `product_cat` is incompatible with prefetching and the group `WPML_Slug_Translation_Records::taxonomy` should be added to the list of non-prefetchable groups. For more information see: hidden link
[11-Jul-2025 10:31:29 UTC] objectcache.notice: The cache key `product_tag` is incompatible with prefetching and the group `WPML_Slug_Translation_Records::taxonomy` should be added to the list of non-prefetchable groups. For more information see: hidden link
other ones
[11-Jul-2025 10:31:52 UTC] PHP Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the
woocommerce-aelia-currencyswitcher
domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the
init
action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home/245274.cloudwaysapps.com/qjezzcvrjc/public_html/wp-includes/functions.php on line 6121
[11-Jul-2025 10:31:52 UTC] PHP Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the
woocommerce-wholesale-prices-premium
domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the
init
action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home/245274.cloudwaysapps.com/qjezzcvrjc/public_html/wp-includes/functions.php on line 6121
[11-Jul-2025 10:31:52 UTC] PHP Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the
wp-asset-clean-up
domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the
init
action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home/245274.cloudwaysapps.com/qjezzcvrjc/public_html/wp-includes/functions.php on line 6121
[11-Jul-2025 10:31:53 UTC] PHP Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the
acf
domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the
init
action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home/245274.cloudwaysapps.com/qjezzcvrjc/public_html/wp-includes/functions.php on line 6121
Languages: English (English )German (Deutsch )French (Français )
Timezone: Europe/Zagreb (GMT+02:00)
Could you please provide me with the following:
- WordPress admin credentials (temporary access is fine, if preferred).
- A brief description of how and where this error occurs—for example, what actions you're taking or which page is being accessed when the message appears.
