[Resolved] I get error 500 when saving page

I am trying to: update an existing page

Link to a page where the issue can be seen: I can not link to a back office page

I expected to see: saved changes

Instead, I got: Error code 500

Here is the error log:

Here is the error code:

[11-Sep-2023 11:40:00 UTC] PHP Fatal error: Uncaught TypeError: array_filter(): Argument #1 ($array) must be of type array, bool given in /.../wp-content/plugins/sitepress-multilingual-cms/classes/translation-jobs/class-wpml-element-translation-package.php:319
Stack trace:
#0 /.../wp-content/plugins/sitepress-multilingual-cms/classes/translation-jobs/class-wpml-element-translation-package.php(319): array_filter(false)
#1 /.../wp-content/plugins/sitepress-multilingual-cms/classes/translation-jobs/class-wpml-element-translation-package.php(92): WPML_Element_Translation_Package->add_custom_field_contents(Array, NULL, Array, NULL)
#2 /.../wp-content/plugins/sitepress-multilingual-cms/inc/actions/wpml-tm-action-helper.class.php(13): WPML_Element_Translation_Package->create_translation_package(NULL)
#3 /.../wp-content/plugins/sitepress-multilingual-cms/inc/actions/wpml-tm-post-actions.class.php(72): WPML_TM_Action_Helper->create_translation_package('56')
#4 /.../wp-content/plugins/sitepress-multilingual-cms/inc/functions-load-tm.php(942): WPML_TM_Post_Actions->save_post_actions(2662, Object(WP_Post), false)
#5 /.../wp-includes/class-wp-hook.php(310): wpml_tm_save_post(2662, Object(WP_Post), false)
#6 /.../wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters('', Array)
#7 /.../wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#8 /.../wp-content/plugins/sitepress-multilingual-cms/inc/post-translation/wpml-post-translation.class.php(213): do_action('wpml_tm_save_po...', 2662, Object(WP_Post), false)
#9 /.../wp-content/plugins/sitepress-multilingual-cms/inc/post-translation/wpml-admin-post-actions.class.php(123): WPML_Post_Translation->after_save_post('56', Array, 'ro', 'en')
#10 /.../wp-includes/class-wp-hook.php(312): WPML_Admin_Post_Actions->save_post_actions(2662, Object(WP_Post))
#11 /.../wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(NULL, Array)
#12 /.../wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#13 /.../wp-includes/post.php(4751): do_action('save_post', 2662, Object(WP_Post), true)
#14 /.../wp-includes/post.php(4853): wp_insert_post(Array, false, true)
#15 /.../wp-content/plugins/elementor/core/settings/page/manager.php(353): wp_update_post(Array)
#16 /.../wp-content/plugins/elementor/core/settings/page/manager.php(122): Elementor\Core\Settings\Page\Manager->save_post_status(2662, 'publish')
#17 /.../wp-content/plugins/elementor/core/base/document.php(1688): Elementor\Core\Settings\Page\Manager->ajax_before_save_settings(Array, 2662)
#18 /.../wp-content/plugins/elementor/core/base/document.php(746): Elementor\Core\Base\Document->save_settings(Array)
#19 /.../wp-content/plugins/elementor/core/documents-manager.php(545): Elementor\Core\Base\Document->save(Array)
#20 [internal function]: Elementor\Core\Documents_Manager->ajax_save(Array, Object(Elementor\Core\Common\Modules\Ajax\Module))
#21 /.../wp-content/plugins/elementor/core/common/modules/ajax/module.php(175): call_user_func(Array, Array, Object(Elementor\Core\Common\Modules\Ajax\Module))
#22 /.../wp-includes/class-wp-hook.php(310): Elementor\Core\Common\Modules\Ajax\Module->handle_ajax_request('')
#23 /.../wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(NULL, Array)
#24 /.../wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#25 /.../wp-admin/admin-ajax.php(188): do_action('wp_ajax_element...')
#26 {main}
thrown in /.../wp-content/plugins/sitepress-multilingual-cms/classes/translation-jobs/class-wpml-element-translation-package.php on line 319