[Résolu] Second language posts causes fatal error

Background of the issue:
I am trying to save a post in the French language (second language).

Symptoms:
I got a fatal error: Fatal error: Uncaught TypeError: array_filter(): Argument #1 ($array) must be of type array, bool given in /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-content/plugins/sitepress-multilingual-cms/classes/translation-jobs/class-wpml-element-translation-package.php:319 Stack trace: #0 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-content/plugins/sitepress-multilingual-cms/classes/translation-jobs/class-wpml-element-translation-package.php(319): array_filter() #1 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-content/plugins/sitepress-multilingual-cms/classes/translation-jobs/class-wpml-element-translation-package.php(92): WPML_Element_Translation_Package->add_custom_field_contents() #2 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-content/plugins/sitepress-multilingual-cms/inc/actions/wpml-tm-action-helper.class.php(13): WPML_Element_Translation_Package->create_translation_package() #3 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-content/plugins/sitepress-multilingual-cms/inc/actions/wpml-tm-post-actions.class.php(72): WPML_TM_Action_Helper->create_translation_package() #4 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-content/plugins/sitepress-multilingual-cms/inc/functions-load-tm.php(947): WPML_TM_Post_Actions->save_post_actions() #5 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/class-wp-hook.php(324): wpml_tm_save_post() #6 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #7 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/plugin.php(517): WP_Hook->do_action() #8 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-content/plugins/sitepress-multilingual-cms/inc/post-translation/wpml-post-translation.class.php(213): do_action() #9 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-content/plugins/sitepress-multilingual-cms/inc/post-translation/wpml-admin-post-actions.class.php(123): WPML_Post_Translation->after_save_post() #10 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/class-wp-hook.php(326): WPML_Admin_Post_Actions->save_post_actions() #11 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #12 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/plugin.php(517): WP_Hook->do_action() #13 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/post.php(4891): do_action() #14 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/post.php(4993): wp_insert_post() #15 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-content/plugins/fusion-builder/shortcodes/fusion-global.php(209): wp_update_post() #16 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/class-wp-hook.php(324): FusionSC_Global->update_global_elements() #17 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/plugin.php(205): WP_Hook->apply_filters() #18 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/post.php(2957): apply_filters() #19 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/post.php(2842): sanitize_post_field() #20 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/post.php(4247): sanitize_post() #21 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-includes/post.php(4993): wp_insert_post() #22 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-admin/includes/post.php(453): wp_update_post() #23 /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-admin/post.php(227): edit_post() #24 {main} thrown in /home/1008615.cloudwaysapps.com/fcshkmukpp/public_html/webroot/wp-content/plugins/sitepress-multilingual-cms/classes/translation-jobs/class-wpml-element-translation-package.php on line 319

Questions:
Why am I getting a fatal error when saving a post in the French language?
How can I resolve the TypeError in the WPML plugin?