Problem with tweening of a body

[Hamster going HAM]

Hey everyone, im pretty new to Panda, but had a great experience this far.

I have a problem using a tween to "interlace" the position of a player from his current, local position, to the position given by the server (in code "newPosX/Y"). If i just set the position, it works fine, but it creates these ugly jumps when there is a lag, it would look better if the playerbody just "slides" to the new position.

 

I have tried it like this:

game.module(    'game.player'    ).require(    'plugins.p2').body(function () {  game.createClass('Player', {  dead: true,  newPosX: 0,  newPosY: 0,    init: function (x, y, name) {    this.body = new game.Body({    mass: 1,    position: [       x / game.scene.world.ratio,       y / game.scene.world.ratio    ],    angularVelocity: 1    });   this.body.addShape(new game.Circle(this.size));   game.scene.world.addBody(this.body);   this.hudcontainer = new game.Container().addTo(game.scene.stage);},        update: function () {         this.sprite.position.x = this.body.position[0];         this.sprite.position.y = this.body.position[1];},        syncwithserver: function (newPosX, newPosY, rotation) {        //this.body.position[0] = this.newPosX;        //this.body.position[1] = this.newPosY        this.newPosX = newPosX;        this.newPosY = newPosY;        this.tween = new game.Tween(this.body.position);        this.tween.to({ x: this.newPosX, y: this.newPosY }, 50);        this.tween.start();        this.sprite.rotation = rotation;},});});   

I deleted some irrelevant code...

 

The "syncwithserver" function currently gets called every 50 ms. The debugger says that "this.tween.start()" has x and y data on both "valuesEnd" and "valuesStart", so a tween between the two positions should be possible.

Can someone tell me where i went wrong? Or would there be a better method to avoid the jumps when a new position should be set?