On null level crash, even with isLevelLoaded() check

Why? :/

PHP:

public function Second(){

foreach($this->games as $game => $value){

$Arena = $value["Arena"];

if($this->getServer()->isLevelLoaded($Arena)){

$Phase = $value["Phase"];
$RedPoints = $value["RedPoints"];
$BluePoints = $value["BluePoints"];



foreach($this->getServer()->getLevelByName($Arena)->getPlayers() as $player){

if($this->getTeam($player) == "Red"){
$player->sendTip("§c". $RedPoints." §b".$BluePoints);
}


if($this->getTeam($player) == "Blue"){
$player->sendTip("§b". $BluePoints." §c".$RedPoints);

}}}}
}