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Problem:
Client is getting following PHP error with WPML Sticky Links plugin, on PHP 8.x:

PHP Deprecated: Automatic conversion of false to array is deprecated in .../wp-content/plugins/wpml-sticky-links/classes/class-wpml-sticky-links.php on line 19.

Solution:
Please check this errata https://wpml.org/errata/wpml-sticky-links-deprecated-error-on-php-8-x/ for a workaround.

If this does not resolve the issue or if the solution seems outdated or irrelevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix,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 needed, please open a new support ticket at WPML support forum for further assistance.