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Uncaught TypeError: Illegal offset type in isset or empty in wp-content/plugins/sitepress-multilingual-cms/classes/core-abstract-classes/class-wpml-element-translation.php:259

$bookingsIds = is_a( reset( $bookingsPosts ), '\WP_Post' ) ? wp_list_pluck( $bookingsPosts, 'ID' ) : $bookingsPosts;

$bookingsIds = is_a( ( $bookingsPosts ), '\WP_Post' ) ? ( $bookingsPosts->ID ) : $bookingsPosts;