Weird problem: Application terminates unexpectedly after closing NSOpenPanel sheet

FROM : Oleg Krupnov
DATE : Fri Jan 09 08:54:04 2009

Here is my code:

//-------------------------------------------------------------------------------------------------
- (IBAction)scanFolder:(id)sender
{
   NSOpenPanel* openPanel = [NSOpenPanel openPanel];
   [openPanel setCanChooseDirectories:YES];
   [openPanel setCanChooseFiles:NO];
   [openPanel setAllowsMultipleSelection:NO];
   [openPanel beginSheetForDirectory:nil
                                file:nil
                     modalForWindow:[sourceView window]
                       modalDelegate:self
                     didEndSelector:@selector(openPanelDidEnd:returnCode:contextInfo:)
                         contextInfo:NULL];
}

//-------------------------------------------------------------------------------------------------
- (void)openPanelDidEnd:(NSOpenPanel*)panel returnCode:(int)returnCode
contextInfo:(void*)contextInfo
{
   if (returnCode == NSOKButton)
   {
       [self activatePath:[[panel filenames] objectAtIndex:0]];
   }
}


It puzzles me that the application is terminated unexpectedly without
any error messages in the console after the stack is unwinded up from
the openPanelDidEnd function.

What might I be doing wrong?