XCode Debugging Help

Hi there,
I am just getting into using XCode as a debugger. Up until now, I had not realized XCode points at any error that may occur in script. What I am wondering is, to me, XCode does not tell me much about the error beyond its function title.

See here…

///

What I am wondering is, from this image, beyond the title of the function, what can I take from this information?

Here is the function…

	void brainPokerHitDB(int pokerClassDel){
		//sent from dummyPoker on brain projectile
		damageGiven = damageGivens[pokerClassDel];///I BELIVE THIS IS THE ERROR, HOWEVER IT IS 100% THIS ARRAY.LENGHT > pokerCLassDel...???
		takeDamage();
		
		//for audio consitent with this wpn. 
		//must play audio for this pokerClassDel
		if(audioHitMng)///for certain db ex. fatty.
		audioHitMng.playAudioHit(pokerClassDel);		
	}

Thats probably a null reference exception.
Probably damgeGivens or audiohitmng is null.

do if(damageGivens == null) and the same thing to audio hit