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This thread is resolved. Here is a description of the problem and solution.

Problem:
The client experienced a critical error on their website after restoring a backup from mid-December. The error was linked to the WPML plugin, which when disabled, resolved the error but removed the language switching option. Additionally, some products in the English version lacked size selection options, which were available in the Polish version.
Solution:
We recommended re-enabling the WPML plugins, including WPML String Translations and the WooCommerce Multilingual plugin, to address the critical error and restore language functionality. For the issue with product size options not appearing in the English version, updating the product from the default language (Polish) should resolve the issue. If the problem persists with other products, updating each from the default language is advised.

Please note that this solution might be outdated or not applicable to your specific case. If the issue persists, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying you have the latest versions of themes and plugins, and if necessary, opening a new support ticket at WPML support forum for further assistance.

This is the technical support forum for WPML - the multilingual WordPress plugin.

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This topic contains 24 replies, has 0 voices.

Last updated by Shekhar Bhandari 2 months, 3 weeks ago.

Assisted by: Shekhar Bhandari.

Author Posts
January 8, 2026 at 7:35 am #17711731

tomaszK-61

I'd like to speak to a human. The client introduced an error on the website, and I uploaded a backup from mid-December. Unfortunately, a critical error appeared on the website. After checking the debug, it turned out that the problem was caused by the WPML plugin. I renamed the plugin folder to sitepress-multilingual-cms_OFF, and the website started working, but there's no option to change the language; the plugin is disabled.

January 8, 2026 at 1:58 pm #17713152

tomaszK-61

I added and activated both WPML plugins and backed up the site. Unfortunately, I see that after switching to English, the currency on the site doesn't change to euros, which was working previously.

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January 8, 2026 at 2:13 pm #17713193

tomaszK-61

There's also no way to add keys to payment methods in Euro. This was possible before, and it worked before.

paymnet-metod.jpg
January 8, 2026 at 2:49 pm #17713376

Shekhar Bhandari
WPML Supporter since 03/2015

Languages: English (English )

Timezone: Asia/Kathmandu (GMT+05:45)

Hello there,

It looks like you haven't enabled WooCommerce Multilingual plugin yet, please enable WPML plugins, WPML string translations and WooCommerce Multilingual plugin and see if it helps.

Look forward to your reply.

Thanks

January 11, 2026 at 9:16 am #17718815

tomaszK-61

I'll do some tests tomorrow and come back with an answer, thank you.

January 12, 2026 at 2:46 am #17719860

Shekhar Bhandari
WPML Supporter since 03/2015

Languages: English (English )

Timezone: Asia/Kathmandu (GMT+05:45)

Sure, will wait for your feedback.

January 15, 2026 at 7:06 pm #17735143

tomaszK-61

Could you please check if the Corsen debug file is still active and collecting information? I reported a problem to support a while ago, and recently, when I made a backup, it seemed like a large debug file was downloading. I'm attaching a screenshot.

debug-couple.jpg
January 15, 2026 at 7:11 pm #17735199

tomaszK-61

I also wonder why some products in the English version do not have the option to select a size, since the information is taken from the Polish version?

For example:
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January 18, 2026 at 10:46 am #17739945

tomaszK-61

Earlier I mentioned Corsen debug file, I meant WPML plugin of course, sorry.

January 20, 2026 at 3:06 am #17744461

Shekhar Bhandari
WPML Supporter since 03/2015

Languages: English (English )

Timezone: Asia/Kathmandu (GMT+05:45)

Hello there,

Looks like it's a different issue then the fatal error.

To debug this issue further, I would need to check your site settings once, for this I would need temporary access (wp-admin and ftp) to your site.

So could you please provide me with those details, you will find the needed fields for this below the comment area when you log in to leave your next reply.
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This info is private and available to you and WPML supporters only.
Read more about this: https://wpml.org/purchase/support-policy/privacy-and-security-when-providing-debug-information-for-support/

Note:
Backup your sites before providing the credentials or if possible provide credentials for the test site

Look forward to your reply.

Thanks

January 26, 2026 at 3:58 am #17760827

Shekhar Bhandari
WPML Supporter since 03/2015

Languages: English (English )

Timezone: Asia/Kathmandu (GMT+05:45)

Hello there,

Just updating the product from the default language solves the problem for me, can you please try this and see if it helps for other products, if not, please provide me the links to those products.

Thanks

January 27, 2026 at 4:34 am #17764823

tomaszK-61

We'll run some tests today/tomorrow, thank you.
Is there any news regarding the debug file?

January 27, 2026 at 4:39 am #17764826

Shekhar Bhandari
WPML Supporter since 03/2015

Languages: English (English )

Timezone: Asia/Kathmandu (GMT+05:45)

Hello there,

The ftp details is not working for me, so I couldn't check the debug.log file, anyway you can disable the debug.log by settings wp_debug to false on the wp-config.php file.

Thanks

January 30, 2026 at 7:35 am #17775902

tomaszK-61

Hi,

We tested the products in the English version. Size selection is not available in the TRENCHES category:

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And in this product:

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January 30, 2026 at 7:39 am #17775905

tomaszK-61

When editing the HARPER SCARF product in the Polish version, we see that editing options are disabled, while in the English version they are enabled. So far, it's the other way around in other products. Why is this error?

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harper-scarf.jpg