Climb on walls

I'm trying to make it so when someone where's a helmet they can climb up walls but my code doesn't seem to work

PHP:

public function onClimb(EntityMotionEvent $event){

   $player = $event->getPlayer();
   $helmetid = $player->getInventory()->getHelmet()->getId();
     $helmetd = $player->getInventory()->getHelmet()->getDamage();

    if($helmetid === 397){
    if($helmetd === 1){

   $blocks = $player->getLevel()->getBlock($player)->getHorizontalSides();
  $nonair = 0;

   foreach ($blocks as $block){

       if($block->getId() !== Block::AIR && $block->isSolid()){

        $nonair++;

      }
  }

      if($nonair > 0){
          if(!$player->getGenericFlag(Entity::DATA_FLAG_WALLCLIMBING)){

       $player->setGenericFlag(Entity::DATA_FLAG_WALLCLIMBING, true);

        }

   $player->resetFallDistance();

           }else{

          if($player->getGenericFlag(Entity::DATA_FLAG_WALLCLIMBING)){
      $player->setGenericFlag(Entity::DATA_FLAG_WALLCLIMBING, false);

       }
   }
}

            }else{

         if($player->getGenericFlag(Entity::DATA_FLAG_WALLCLIMBING)){
   $player->setGenericFlag(Entity::DATA_FLAG_WALLCLIMBING, false);

     }
   }