pocketmine\ThreadManager::getInstance PHP Method

    public static function getInstance()
    {
        return self::$instance;
    }

 public function onDisable()
 {
     $this->getLogger()->info(TextFormat::DARK_RED . "Disabled");
     $this->getServer()->getLogger()->removeAttachment($this->attachment);
     ThreadManager::getInstance()->remove($this->thread);
     $this->thread->kill();
 }