[Geschlossen] Uncaught TypeError: Illegal offset type in isset or empty (class-wpml-element-translation.php:282)

Background of the issue:
I am trying to resolve a recurring error in the WPML plugin. The error occurs because a function is receiving a non-scalar value, causing an issue on line 282 in the file /sitepress-multilingual-cms/classes/core-abstract-classes/class-wpml-element-translation.php. This is the line causing the error: if ( ! $element_id || ! isset( $this->translations[ $element_id ] ) ) {. Link to a page where the issue can be seen: versteckter Link

Symptoms:
Uncaught TypeError: Illegal offset type in isset or empty on line 282 of the file /public_html/wp-content/plugins/sitepress-multilingual-cms/classes/core-abstract-classes/class-wpml-element-translation.php. The error occurs during the synchronization of product translations.

Questions:
What could be the reason that the function is getting an unexpected value in a variable?
Please improve the condition to be prepared for this possibility and avoid the error.