How to remove an event listener of Enter Frame

basically, i doing a three level game. 1st level is dodging the stone from sky, Secondly, samsh the wolf head. However, when i enter leve1 2 game, it show me an error.
TypeError: Error #2007: Parameter hitTestObject must be non-null.as:113 Cant access to null object or reference.as.83
I think due to when i enter level 2, the object is not available anymore, so happen this errors,izzit? how i gonna fix this?
package
          import flash.display.MovieClip;
          import flash.events.KeyboardEvent;
          import flash.ui.Keyboard;
          import flash.events.Event;
          import flash.events.MouseEvent;
          import flash.ui.Mouse;
          import flash.utils.Timer;
          import flash.events.TimerEvent;
          import flash.events.Event;
          public class level1 extends MovieClip
                    var vx:int;
                    var vy:int;
                    var collisionHasOccurred:Boolean;
                    var score:uint;
                    public function level1()
                              init();
                    function init():void
                              //Initialize variable
                              vx=0;
                              vy=0;
                              collisionHasOccurred=false;
                              stone.stop();
                              score=0;
                              optionPage.visible=false;
                    //Add event listeners
                    stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
                    stage.addEventListener(KeyboardEvent.KEY_UP, onKeyUp);
                    addEventListener(Event.ENTER_FRAME, onEnterFrame);
                    wolf2.addEventListener(MouseEvent.CLICK, fl_MouseClickHandler);
                    function onKeyDown(event:KeyboardEvent):void
                              if(event.keyCode==Keyboard.LEFT)
                                        vx=-5;
                              else if (event.keyCode==Keyboard.RIGHT)
                                        vx=5;
                              else if (event.keyCode==Keyboard.UP)
                                        vy=-5;
                              else if (event.keyCode==Keyboard.DOWN)
                                        vy=5;
                    function onKeyUp(event:KeyboardEvent):void
                              if (event.keyCode==Keyboard.LEFT || event.keyCode==Keyboard.RIGHT)
                                        vx=0;
                              else if (event.keyCode==Keyboard.DOWN || event.keyCode==Keyboard.UP)
                              vy=0;
                    function onEnterFrame(event:Event):void
                              trace(player);
                              trace(cursor);
                              trace(aaa);
                              trace(wolf2);
                              trace(wolf);
                              //Move the player
                              player.x+=vx; <-------------------------------------------------------------this is line 83
                              player.y+=vy;
                              //collision detection
                              if (stone.hitTestObject(player))
                              player.gotoAndStop(3);
                              health.meter.width-=2;
                              if (! collisionHasOccurred)
                                        score++;
                                        messageDisplay.text=String(score);
                                        collisionHasOccurred=true;
                    else
                              player.gotoAndStop(1);
                              collisionHasOccurred=false;
                    if (health.meter.width <=1)
                              New.text="Game Over!";
                              stop();
                              fl_CountDownTimerInstance_3.stop();
                    if (player.hitTestObject(wall))   <-------------------------------------------------this is line 113
                              player.x-=vx;
                              player.y-=vy;
                    if (player.hitTestObject(wallA))
                              player.x-=vx;
                              player.y-=vy;
                    if (player.hitTestObject(wallB))
                              player.x-=vx;
                              player.y-=vy;
                    if (player.hitTestObject(wallC))
                              player.x-=vx;
                              player.y-=vy;
                    if (player.hitTestObject(wallD))
                              player.x-=vx;
                              player.y-=vy;
                    if (player.hitTestObject(wallE))
                              player.x-=vx;
                              player.y-=vy;
                    if (player.hitTestObject(wallF))
                              player.x-=vx;
                              player.y-=vy;
                    if (player.hitTestObject(wallG))
                              player.x-=vx;
                              player.y-=vy;
                    if (player.hitTestObject(wallH))
                              player.x-=vx;
                              player.y-=vy;
                    function fl_MouseClickHandler(event:MouseEvent):void
                    score++;
                    aaa.text=String(score);
                    trace("Mouse clicked");

instead of:
if (player.hitTestObject(wall))
use:
if(player&&wall){
if (player.hitTestObject(wall))

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