[Resolved] Cannot create multisite

I am trying to: create a new site in multisite setup

Link to a page where the issue can be seen:

I expected to see: the new site created in the backend

Instead, I got:

Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, bool given in /data/sites/web/01kiwanisbe/www/wp-content/plugins/wpml-sticky-links/classes/custom-fields.php:169 Stack trace: #0 /data/sites/web/01kiwanisbe/www/wp-content/plugins/wpml-sticky-links/classes/custom-fields.php(169): array_key_exists('custom_fields_c...', false) #1 /data/sites/web/01kiwanisbe/www/wp-content/plugins/wpml-sticky-links/classes/custom-fields.php(83): WPML\SL\CustomFields->getSettings() #2 /data/sites/web/01kiwanisbe/www/wp-includes/class-wp-hook.php(310): WPML\SL\CustomFields->convertUrlsInCustomField(2, 3, '_elementor_edit...', 'builder') #3 /data/sites/web/01kiwanisbe/www/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(NULL, Array) #4 /data/sites/web/01kiwanisbe/www/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #5 /data/sites/web/01kiwanisbe/www/wp-includes/meta.php(156): do_action('added_post_meta', 2, 3, '_elementor_edit...', 'builder') #6 /data/sites/web/01kiwanisbe/www/wp-includes/meta.php(252): add_metadata('post', 3, '_elementor_edit...', 'builder') #7 /data/sites/web/01kiwanisbe/www/wp-includes/post.php(2548): update_metadata('post', 3, '_elementor_edit...', 'builder', '') #8 /data/sites/web/01kiwanisbe/www/wp-includes/post.php(4578): update_post_meta(3, '_elementor_edit...', 'builder') #9 /data/sites/web/01kiwanisbe/www/wp-content/plugins/elementor/core/kits/manager.php(179): wp_insert_post(Array) #10 /data/sites/web/01kiwanisbe/www/wp-content/plugins/elementor/includes/maintenance.php(113): Elementor\Core\Kits\Manager::create_default_kit() #11 /data/sites/web/01kiwanisbe/www/wp-content/plugins/elementor/includes/maintenance.php(101): Elementor\Maintenance::create_default_kit(Array) #12 /data/sites/web/01kiwanisbe/www/wp-includes/class-wp-hook.php(312): Elementor\Maintenance::Elementor\{closure}(4) #13 /data/sites/web/01kiwanisbe/www/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters('', Array) #14 /data/sites/web/01kiwanisbe/www/wp-includes/plugin.php(565): WP_Hook->do_action(Array) #15 /data/sites/web/01kiwanisbe/www/wp-includes/plugin.php(746): do_action_ref_array('wpmu_new_blog', Array) #16 /data/sites/web/01kiwanisbe/www/wp-includes/ms-site.php(141): do_action_deprecated('wpmu_new_blog', Array, '5.1.0', 'wp_initialize_s...') #17 /data/sites/web/01kiwanisbe/www/wp-includes/ms-functions.php(1401): wp_insert_site(Array) #18 /data/sites/web/01kiwanisbe/www/wp-admin/network/site-new.php(144): wpmu_create_blog('zaventemairport...', '/', 'Zaventemairport', 2, Array, 1) #19 {main} thrown in /data/sites/web/01kiwanisbe/www/wp-content/plugins/wpml-sticky-links/classes/custom-fields.php on line 169