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Problem:
If you're experiencing a fatal error when switching languages on a product category page, specifically with the error message 'Fatal Error Illegal offset type in isset or empty' in

/wp-content/plugins/sitepress-multilingual-cms/classes/core-abstract-classes/class-wpml-element-translation.php:282

, we have identified a solution that does not require modifying the WPML plugin.
Solution:
The issue arises from a piece of code in

wp-content/themes/shopkeeper-child/woocommerce/archive-product.php

that retrieves a term named 'prod-cat__msg_banner'. The error occurs because the value returned is interpreted as an array with a blank element. Here are two solutions:
1. No code: Change the value in the database for the term ID to not be a serialized value. You can reference the original term ID 1135 to see how it is saved.
2. Using code: In

wp-content/themes/shopkeeper-child/woocommerce/archive-product.php

at line 316, after the code:

if (!empty($msg_banner)) { global $wp_query; }

add:

if (is_array($msg_banner)){ $msg_banner = $msg_banner[0]; }

Please test any of the solutions after making a full backup and let us know the results.

If this solution does not resolve your issue or seems outdated, we recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket at WPML support forum.

Problem:
The client was experiencing an issue where product categories were showing duplicate products in different languages, alternating between German (DE) and English (EN), despite not being new products and having worked correctly for many years.

Solution:
We identified that the issue might be due to a conflict with cache settings, specifically involving the Redis cache and the Breeze plugin with Varnish cache configured. We recommended the following steps:
1. Disable the Redis cache or configure it properly.
2. Disable the Varnish cache or configure it properly.
As a workaround, we suggested changing the Product Category slug for the German version from

ktm-250-exc

to

ktm-250-exc-de

and then clearing the caches to see if the issue persists.

If the solution provided here is not relevant to your case, because it might be outdated or not applicable, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue still exists, please open a new support ticket at our support forum.