PlayerTeleportEvent.

So, I enter cmd "/spawn" and then there is a crash. What is the problem? If I don't give enough info about problem, I can give more.

PHP:

private function XYZWfromPlayerTo($evt) {
        return array(
            "xto" => $evt->getTo()->x,
            "yto" => $evt->getTo()->y,
            "zto" => $evt->getTo()->z,
            "wto" => $evt->getTo()->level->getName());  //127 line
    }

public function onEntityTeleport(EntityTeleportEvent $evt) {
        $player = $evt->getEntity();
        if ($player instanceof Player) {
            extract($this->XYZWfromPlayerTo($evt));
        }
}

Code:

Error: Call to a member function getName() on null
Line: 127 (getting name of level)
Type: E_ERROR

I don't sure, but may will it be a problem with spawn coords?..
YES, EURICA! In plugin where this cmd checks, there I use "....(new Pos(x,y,z)..." and DON'T pass the world name!!! There is in the core, exact in Posintion.php constructor, "public function __construct($x = 0, $y = 0, $z = 0, Level $level = null)", so I passed NULLED world.
I'm sorry guys!

$evt->getTo()->getLevel()->getName();