SafeOrient Bukkit Plugin (buggy)

import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.EventHandler;
import org.bukkit.entity.Player;
import org.bukkit.Location;
import org.bukkit.event.player.PlayerMoveEvent;

public class Orientation extends JavaPlugin implements Listener {

        @Override
        public void onEnable(){
            getLogger().info("Safe Orientation successfully loaded.");
            getServer().getPluginManager().registerEvents(this, this);
        }

        @Override
        public void onDisable() {
            getLogger().info("Safe Orientation now exiting.");
        }

        @EventHandler (priority = EventPriority.HIGHEST)
        public void playerMoves(PlayerMoveEvent event) {
            Player thePlayer;
            Location toLoc;
            Location newTo;

            thePlayer = event.getPlayer();
            toLoc = event.getTo();
            if (Float.isNaN(toLoc.getPitch())
                    || Float.isNaN(toLoc.getYaw())) {
                event.setCancelled(true);

                newTo = toLoc.clone();
                newTo.setPitch(
                        Float.isNaN(toLoc.getPitch()) ?
                            ( Float.isNaN(event.getFrom().getPitch()) ?
                                90 : event.getFrom().getPitch() )
                                : toLoc.getPitch()
                    );
                newTo.setYaw(
                        Float.isNaN(toLoc.getYaw()) ?
                            ( Float.isNaN(event.getFrom().getYaw()) ?
                                90 : event.getFrom().getYaw() )
                                : toLoc.getYaw()
                    );

                thePlayer.setVelocity(thePlayer.getVelocity().zero());
                thePlayer.teleport(newTo);
            }
        }

}