thanks joshua.  yes i will try that.  i'm having trouble to recreate the crash 
and that's why i asked. :-)

thanks,

rick





________________________________
From: Joshua Pennington <li...@retaincount.com>
To: Rick C. <jo_p...@yahoo.com>
Cc: "cocoa-dev@lists.apple.com" <cocoa-dev@lists.apple.com>
Sent: Saturday, September 5, 2009 11:17:28 PM
Subject: Re: crash question NSString

Place a breakpoint on objc_exception_throw and eliminate the guesswork.

Cheers,
Joshua

On Sep 5, 2009, at 9:55 AM, "Rick C." <jo_p...@yahoo.com> wrote:

> hello,
> 
> i'm just looking for a confirmation here.  if i'm getting this crash:
> 
> *** Terminating app due to uncaught exception 'NSInvalidArgumentException', 
> reason: '*** -[NSCFString appendString:]: nil argument'
> 
> is it definitely crashing on my NSMutableString appendString: method or is it 
> possible it's also crashing on NSString stringByAppendingString:?  as far as 
> i know either one will throw an exception that's why i'm asking.


      
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