Solved ArmorInventory instance error!?

:44:14] [Server thread/CRITICAL]: TypeError: "Return value of pocketmine\entity\Living::getArmorInventory() must be an instance of pocketmine\inventory\ArmorInventory, null returned" (EXCEPTION) in "src/pocketmine/entity/Living" at line 427

PHP:

public static function armorsHealth($player)
      {
         if($player instanceof Player)
          {
             $l = $player->getArmorInventory()->getLeggings()->getDamage();
             $b = $player->getArmorInventory()->getBoots()->getDamage();
             $c = $player->getArmorInventory()->getChestplate()->getDamage();
             $h = $player->getArmorInventory()->getHelmet()->getDamage();
             $armorhealth = ((100 / 100) - ((($l + $b + $c + $h) / 4) / 100)) * 100;
             if($armorhealth !== null) return $armorhealth;
          } else
              {
                 MTask::cancelMTask();
              }
      }

PHP:

class Mtask extends Task implements Listener {
   
    public function __construct($sender)
      {
         $this->sender = $sender;
      }
     
    public function onRun(int $currentTick)
      {
         $sender = $this->sender;
         $hud = Main::$cfg->get("hud");
         $hud = str_replace([    "{line}", "{health}",     "{armors}",    "{combatlog}"],
                            ["\n",
                             Main::playerHealth($sender),
                             Main::armorsHealth($sender),
                             Main::combatLog($sender)], $hud);
                           
         $sender->sendPopup($hud);
      }
   
    public static function cancelMTask()
      {
         $this->getHandler()->cancel();
      }
}

I tried some tricks to fix it but bruh, nothing is working

 

The Player object wasn't closed I had to check if it isn't close then cancel the task...
Thx for platz1de