title: Uncaught system exception: signal 11
body: <p>Some of my users reported that sometimes they're getting the above error. Unfortunately I can't tell anything from the log file. Probably somewhere in code an object is over-released. Can I somehow catch it and log it?</p>
  
  <p>Normally I'd go with Instruments and NSZobieEnabled but unfortunately it doesn't happen on my machine. Is there any chance to log the object?</p>
  
  <pre><code>1   ExceptionHandling                   0x00000001000879e2 -[NSExceptionHandler _handleException:mask:] + 168
      2   ExceptionHandling                   0x00000001000877ba NSExceptionHandlerUncaughtSignalHandler + 35
      3   libsystem_c.dylib                   0x00007fff9836d8ea _sigtramp + 26
      4   ???                                 0x0000000001440013 0x0 + 21233683
      5   CoreFoundation                      0x00007fff985b525f -[NSArray initWithArray:range:copyItems:] + 591
      6   AppKit                              0x00007fff94a193f3 recursivelyEncodeInvalidPersistentState + 1118
      7   AppKit                              0x00007fff94a194a6 recursivelyEncodeInvalidPersistentState + 1297
      8   AppKit                              0x00007fff94a194a6 recursivelyEncodeInvalidPersistentState + 1297
      9   AppKit                              0x00007fff94a194a6 recursivelyEncodeInvalidPersistentState + 1297
      10  AppKit                              0x00007fff94a194a6 recursivelyEncodeInvalidPersistentState + 1297
      11  AppKit                              0x00007fff94a178aa -[NSPersistentUIManager flushAllChangesOptionallyWaitingUntilDone:updatingSnapshots:] + 1037
      12  AppKit                              0x00007fff94a17467 -[NSPersistentUIManager flushPersistentStateAndClose:waitingUntilDone:] + 180
      13  AppKit                              0x00007fff94a7eba5 -[NSApplication terminate:] + 1701
      14  AppKit                              0x00007fff94aa357e -[NSApplication _terminateFromSender:askIfShouldTerminate:saveWindows:] + 280
      15  AppKit                              0x00007fff94aad4a2 __52-[NSApplication(NSAppleEventHandling) _handleAEQuit]_block_invoke_0 + 46
      16  libdispatch.dylib                   0x00007fff8bd9af01 _dispatch_call_block_and_release + 15
      17  libdispatch.dylib                   0x00007fff8bd970b6 _dispatch_client_callout + 8
      18  libdispatch.dylib                   0x00007fff8bd9c0c8 _dispatch_main_queue_callback_4CF + 275
      19  CoreFoundation                      0x00007fff985a20fe __CFRunLoopRun + 1614
      20  CoreFoundation                      0x00007fff985a16b2 CFRunLoopRunSpecific + 290
      21  HIToolbox                           0x00007fff93fbf0a4 RunCurrentEventLoopInMode + 209
      22  HIToolbox                           0x00007fff93fbed84 ReceiveNextEventCommon + 166
      23  HIToolbox                           0x00007fff93fbecd3 BlockUntilNextEventMatchingListInMode + 62
      24  AppKit                              0x00007fff94858613 _DPSNextEvent + 685
      25  AppKit                              0x00007fff94857ed2 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
      26  AppKit                              0x00007fff9484f283 -[NSApplication run] + 517
      27  AppKit                              0x00007fff947f3cb6 NSApplicationMain + 869
  </code></pre>