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Problem:
After updating WPML and other plugins, a critical error occurs on some WooCommerce product pages when the WPML String Translation plugin is active. Deactivating the plugin resolves the issue temporarily.
Solution:
To permanently fix the issue, modify the code in two files:
1. Navigate to

/wp-content/plugins/sitepress-multilingual-cms/addons/wpml-page-builders/classes/Integrations/Elementor/DataConvert.php

and replace the unserializeString function with the following code:

private static function unserializeString( $string, $associative ) {<br />    // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.serialize_unserialize<br />    $value = is_serialized( $string ) ? unserialize( $string ) : json_decode( $string, $associative );<br />    if ($value === null){<br />        return $string;<br />    }<br />    return $value;<br />}

2. Go to

/wp-content/plugins/sitepress-multilingual-cms/addons/wpml-page-builders/classes/Integrations/Elementor/Hooks/QueryFilter.php

and replace the translateQueryIds function with:

public function translateQueryIds( $value, $object_id, $meta_key, $single ) {<br />    if ( WPML_Elementor_Data_Settings::META_KEY_DATA === $meta_key && $single ) {<br />        $value = get_post_meta( $object_id, WPML_Elementor_Data_Settings::META_KEY_DATA, true );<br />        if ( $value ) {<br />            $value = DataConvert::unserialize( $value, false );<br />            $value = this->recursivelyTranslateQueryIds( $value );<br />            if (is_array($value)) {<br />                $value = DataConvert::serialize($value, false);<br />            }<br />        }<br />    }<br /><br />    return $value;<br />}

After making these changes, save the files. This solution was successfully applied to a staging site, resolving the issue.

Please note that this solution might be outdated or not applicable to your specific case. If the problem persists, we highly recommend checking related known issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If needed, do not hesitate to open a new support ticket.

Problem:
You are seeing four PHP errors related to WPML on your website.
Solution:
The errors you are encountering are 'deprecated' warnings in PHP. This means that the functions causing these warnings are outdated and discouraged for use, as they may be removed in future PHP versions. To resolve these warnings, we recommend updating to a PHP version that is fully compatible with WordPress, such as PHP 7.4 or 8.0. This update should eliminate the deprecated warnings.

If this solution does not apply to your situation, or if it seems outdated, please check the related known issues and confirm that you have installed the latest versions of themes and plugins. If the problem persists, we highly recommend opening a new support ticket with us for further assistance. You can do so at our support forum.