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crash in -[_NSArrayControllerTreeNode _safeNodeAtIndexPath:]

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crash in -[_NSArrayControllerTreeNode _safeNodeAtIndexPath:]

Subject: crash in -[_NSArrayControllerTreeNode _safeNodeAtIndexPath:]
From: Steve Christensen <email@hidden>
Date: Sat, 06 Jun 2009 13:32:26 -0700

I'm seeing a crash in -[_NSArrayControllerTreeNode _safeNodeAtIndexPath:] but I'm not really sure why. That would be "why" in the sense of what -[_NSArrayControllerTreeNode _safeNodeAtIndexPath:] might be doing or of something I should or shouldn't have done vs. saying that it crashed because of a nil pointer. :)

A little more background: I am using Karelia's iMediaBrowser framework in a project. I have created a custom media parser that generates information for the browser to display in an outline view. There is also a button in the UI that refreshes the data. It is in response to clicking that button that [someMutableArray setArray:...] is being called and then is crashing down in the bowels of AppKit.

Thoughts?

Steve

------------------------------
OS Version: 10.4.11 (Build 8S2167)
Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_PROTECTION_FAILURE (0x0002) at 0x00000010

Thread 0 Crashed: 0 com.apple.AppKit 0x93836ca1 -[_NSArrayControllerTreeNode _safeNodeAtIndexPath:] + 150 1 com.apple.AppKit 0x93838585 -[NSTreeController _prepareArrayControllerTree] + 337 2 com.apple.AppKit 0x9383bec5 -[NSTreeController setContent:] + 478 3 com.apple.AppKit 0x935347ac -[NSArrayDetailBinder _refreshDetailContentInBackground:] + 1559 4 com.apple.Foundation 0x928cb174 -[NSObject (NSKeyValueObserverNotification) didChange:valuesAtIndexes:forKey:] + 1029 5 com.apple.Foundation 0x928c7aeb - [NSKeyValueNotifyingMutableArray removeLastObject] + 192 6 com.apple.Foundation 0x928018d4 -[NSMutableArray removeAllObjects] + 64 7 com.apple.Foundation 0x9281a749 -[NSMutableArray setArray:] + 38 ...

Thread 0 crashed with X86 Thread State (32-bit):
  eax: 0x00000000  ebx: 0x93836c19  ecx: 0x90aade80  edx: 0x00000001
  edi: 0x00000000  esi: 0x00000000  ebp: 0xbfffe728  esp: 0xbfffe6f0
   ss: 0x0000001f  efl: 0x00010293  eip: 0x93836ca1   cs: 0x00000017
   ds: 0x0000001f   es: 0x0000001f   fs: 0x00000000   gs: 0x00000037

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