why does this crash?

[David Wetzel]

Hi folks,

maybe I am too tired to see the problem...

  if (string_)
    {
      NSData* newData=nil;
      NSString* _string=nil;
      NSLog(@"DAVE string_ ....");
      NSLog(@"DAVE string_ %p",string_);
      if (string_ == EONullNull) {
      NSLog(@"DAVE string_ is EONullNull");
      }
      NSLog(@"DAVE string_ 1");
      
      NSLog(@"DAVE string_ class = %@",[string_ class]);
      _string=[NSString stringWithObject:string_];

(.....)

The output is:

2002-05-31 13:56:38.124 PDFDemo[8455] File GSWKeyValueAssociation.m: 73. In 
[GSWKeyValueAssociation -valueInObject:] retValue=(nil) () (class=(nil))
2002-05-31 13:56:38.124 PDFDemo[8455] DAVE string_ ....
2002-05-31 13:56:38.124 PDFDemo[8455] DAVE string_ 0x481714d0
2002-05-31 13:56:38.124 PDFDemo[8455] DAVE string_ 1
(no debugging symbols found)...
Program received signal SIGSEGV, Segmentation fault.
0x8053a01 in objc_msg_lookup ()
(gdb) 
(gdb) bt
#0  0x8053a01 in objc_msg_lookup ()
#1  0x481708e2 in _i_GSWResponse_GSWContentConveniences_appendContentString_ ()
#2  0x481712a4 in _i_GSWResponse_GSWHTMLConveniences_appendContentHTMLString_
    ()
#3  0x481ba8a4 in _i_GSWText_GSWTextA_appendToResponse_inContext_ ()
#4  0x481cd36e in 
_i_GSWHTMLStaticElement_GSWHTMLStaticElementA_appendToResponse_inContext_elementsFromIndex_toIndex_
 ()

for those who don't have GSWeb:

@implementation NSString (stringWithObject)

//--------------------------------------------------------------------
+(NSString*)stringWithObject:(id)object_
{
  NSString* _string=nil;
  if (object_)
        {
          if ([object_ isKindOfClass:[NSString class]])
                _string=[[object_ copy] autorelease];
#ifdef GDL2
          else if ([object_ isKindOfClass:[EONull class]])
                _string=@"";
#else
          else if ([object_ isKindOfClass:[NSNull class]])
                _string=@"";
#endif
          else if ([object_ respondsToSelector:@selector(stringValue)])
                _string=[object_ stringValue];
          else if ([object_ respondsToSelector:@selector(description)])
                _string=[object_ description];
          else
                _string=object_;
        };
  return _string;
};
@end

Any ideas?

---
   _  _
 _(_)(_)_  David Wetzel, Turbocat's Development,
(_) __ (_) Buchhorster Strasse 23, D-16567 Muehlenbeck/Berlin, FRG,
  _/  \_   Fax +49 33056 82835 Phone +49 33056 82834
 (______)  http://www.turbocat.de/  dave@turbocat.de