[Action Script] removeChild error 2007 June,2012

First off I'd like to say I did a search on this and although there are many subjects on the matter, none really apply to mine.

My problem is this: There is an enemy on the stage(enemyTwo) in which I remove if its health meter gets below a certain point. You lower the enemy's health by hitting it with little daggers that you throw.

Everything works fine up to a point, the health bar slowly goes down and the enemy even seems to disappear when the removeChild/enemyTwo = null directives are called, however, there seems to be a small window of time where the daggers will hit an invisible version of the enemy which in turn gives me the "Error #2007: Parameter hitTestObject must be non-null" error which in turn causes other things to go awry or Id just ignore it =).


ActionScript Code: public function checkCollisionWithEnemies(bullet:MovieClip)        {                        if(enemyTwo != null)            {                if(enemyTwo.hitTestObject(bullet))                {                    enemyTwo.subObject.meter.width -= 10;                    removeChild(bullet);                                                            if(enemyTwo.subObject.meter.width < 3)                    {                                                enemyTwo.stop();                        removeChild(enemyTwo);                        enemyTwo = null;                                            }                }                                            }         }
ActionScript Code: private function onEnter(evt:Event):void        {                        y -= 10;            rotation += 20;                        MovieClip(parent).checkCollisionWithEnemies(this);                                }
Any insight would be appreciated.
removeChild error 2007

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