Block can't break in specific area

PHP:

if($item->getId() == 352){
            $level = $player->getLevel();
            for($count = 0; $count >= 0; $count--){
            $bpos = $level->getBlockIdAt($block->x + 0, $block->y + $count, $block->z);
                if($bpos != 7 && $bpos != 5){
                    $level->setBlockIdAt($block->x + 0, $block->y + $count, $block->z, 0);
                    $item = Item::get($bpos, 0, 1);  
                    $level->dropItem(new Vector3($block->x + 0, $block->y + $count, $block->z), $item);
                }

I can't this item can break block in iProtector's area (edit flag)