Odd CF_forwarding_prep_0 crash - possible UITableView delegate issue? - ios

Question

I'm trying to analyze a log for what appears to be an intermittent crash.
Here's the stack trace for the thread that throws the exception:
Thread : Fatal Exception: NSInvalidArgumentException
0 CoreFoundation 0x2ab5f49f __exceptionPreprocess + 126
1 libobjc.A.dylib 0x38315c8b objc_exception_throw + 38
2 CoreFoundation 0x2ab5f3e5 -[NSException initWithCoder:]
3 Foundation 0x2b862389 -[NSProxy doesNotRecognizeSelector:] + 68
4 CoreFoundation 0x2ab627d7 ___forwarding___ + 714
5 CoreFoundation 0x2aa94058 _CF_forwarding_prep_0 + 24
6 UIKit 0x292648cb -[UIScrollViewAccessibility _axCleanupDelegateClearer] + 98
7 UIKit 0x29264965 -[UIScrollViewAccessibility dealloc] + 60
8 UIKit 0x2e19c8b1 -[UITableView dealloc] + 1572
9 UIKit 0x2924dc91 -[UITableViewAccessibility dealloc] + 172
10 libobjc.A.dylib 0x38314da1 object_cxxDestructFromClass(objc_object*, objc_class*) + 116
11 libobjc.A.dylib 0x3831e5f7 objc_destructInstance + 34
12 libobjc.A.dylib 0x3831e61b object_dispose + 14
13 UIKit 0x2e3214d1 -[UIResponder dealloc] + 96
14 UIKit 0x2e18eb55 -[UIViewController dealloc] + 1760
15 CoreFoundation 0x2aa6600d CFRelease + 600
16 CoreFoundation 0x2aa7968f -[__NSArrayI dealloc] + 66
17 libobjc.A.dylib 0x3832fd5f objc_object::sidetable_release(bool) + 166
18 libobjc.A.dylib 0x383301a9 (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 404
19 CoreFoundation 0x2aa71149 _CFAutoreleasePoolPop + 16
20 UIKit 0x2e01789f _wrapRunLoopWithAutoreleasePoolHandler + 42
21 CoreFoundation 0x2ab25d95 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 20
22 CoreFoundation 0x2ab23453 __CFRunLoopDoObservers + 278
23 CoreFoundation 0x2ab2385b __CFRunLoopRun + 914
24 CoreFoundation 0x2aa713c1 CFRunLoopRunSpecific + 476
25 CoreFoundation 0x2aa711d3 CFRunLoopRunInMode + 106
26 GraphicsServices 0x31e6f0a9 GSEventRunModal + 136
27 UIKit 0x2e080fa1 UIApplicationMain + 1440
28 MyApp 0x000938b1 main (main.mm:21)
29 libdyld.dylib 0x38895aaf start + 2
And here's the stack trace for the main thread:
Thread : Crashed: com.apple.main-thread
0 libsystem_kernel.dylib 0x3895bdfc __pthread_kill + 8
1 libsystem_pthread.dylib 0x389d9d37 pthread_kill + 62
2 libsystem_c.dylib 0x388fb909 abort + 76
3 libc++abi.dylib 0x37c399c9 __cxa_bad_cast
4 libc++abi.dylib 0x37c53671 default_unexpected_handler()
5 libobjc.A.dylib 0x38315f25 _objc_terminate() + 192
6 libc++abi.dylib 0x37c50de3 std::__terminate(void (*)()) + 78
7 libc++abi.dylib 0x37c508af __cxa_rethrow + 102
8 libobjc.A.dylib 0x38315dd3 objc_exception_rethrow + 42
9 CoreFoundation 0x2aa7145d CFRunLoopRunSpecific + 632
10 CoreFoundation 0x2aa711d3 CFRunLoopRunInMode + 106
11 GraphicsServices 0x31e6f0a9 GSEventRunModal + 136
12 UIKit 0x2e080fa1 UIApplicationMain + 1440
13 MyApp 0x000938b1 main (main.mm:21)
Looking through the trace with the exception, I see a CF_forwarding_prep_0 message, which is followed by an [NSProxy doesNotRecognizeSelector] exception. Reading that, is it a safe assumption that the cause of the issue is that there's a pointer to a tableview delegate that isn't being set to nil? That's about the only discernible thing I see here.
Any help would be most appreciated. Thanks!