My Game Crashes

My game crashes even though it has no fps problems. It crashes after main character collides with other objects. There is a script that is executed after collision. Can it be main reason for it? Will there be performance stabilizations in next upgrades?

here is the script





var _speed;
var _enabled = false;
var _physics;
var vel ;
var pos;
var speed;
var speedY;
var trail;
var trailC;
var score;

function init(){

_physics = this.entity().physics();
if(_physics && _physics.type() != 'kDynamic'){
_physics = null;
}
}
function update( dt ){

dt = 1/60.0; // fixed delta time

if(_enabled){

this.emitSignal('Sound',true)
pos = this.entity().position();
this.entity().physics().setAngularVelocity(-8,0,-5)
this.entity().setTexture('Number 2')
this.entity().setColor(59,0,134);
speed = -1.70;
speedY= 5;

if(pos.z%1 < -0.5){

if(pos.z%1> -0.7){

speed -= 0.1



}

}

if(pos.z%1<-0.1){

if(pos.z%1>-0.5){

speed += 0.1
}
}

_physics.setLinearVelocity( 0, 10, speed);









}

}

function signal( name, value){

this.scene().addScoreCoin(1)



_enabled = value;

}

 

A script can crash buildbox if something is wrong but I am not sure what it would be