Solved Set a config value

I tried this:

PHP:

$d = $this->plugin->stats->get($name)["deaths"];
            var_dump($d);
            $d1 = $d + 1;
            $this->plugin->stats->set($name["deaths"], $d1);

But there is an error on the last line. How would I properly set it?

I do this:

PHP:

public function onEnable(){
$this->players = (new Config($this->getDataFolder()."players.yml", Config::YAML))->getAll(); // Load config in array
}

public function onDisable(){
$this->players = new Config($this->getDataFolder()."players.yml", Config::YAML) // Save array in config.
}

public function addDeath($player){
$name = ($player instanceof Player ? $player->getName() : $player);
if(isset($this->players[$name]['deaths'])){
$this->players[$name]['deaths']++;
return true;
}
return false
}