function dozent_is_completed_course_content($content_ID = 0, $user_ID = 0)
	{
		global $wpdb;

		$content_ID = dozent_get_post_id($content_ID);
		$user_ID = dozent_get_user_id($user_ID);

		$is_completed = $wpdb->get_row(
			$wpdb->prepare(
				"SELECT * FROM $wpdb->dozent_completes
        where content_id = %d
        AND user_id = %d ;", [$content_ID, $user_ID])
		);

		return $is_completed;
	}