The first crash was caused by a call to removeAllObjects, and the second, addObject:
2013-08-01 21:54:05.706 Zipper[1754:1803] An uncaught exception was raised
2013-08-01 21:54:05.721 Zipper[1754:1803] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM removeObjectAtIndex:]: index 201 beyond bounds [0 .. 198]'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff94017b06 __exceptionPreprocess + 198
1 libobjc.A.dylib 0x00007fff99d043f0 objc_exception_throw + 43
2 CoreFoundation 0x00007fff93fb4a04 -[__NSArrayM removeObjectAtIndex:] + 276
3 CoreFoundation 0x00007fff93ff457f -[NSMutableArray removeAllObjects] + 79
4 Zipper 0x000000010000f760 __21-[JOxxx jo_parse]_block_invoke + 368
5 libdispatch.dylib 0x00007fff8fe9af01 _dispatch_call_block_and_release + 15
6 libdispatch.dylib 0x00007fff8fe970b6 _dispatch_client_callout + 8
7 libdispatch.dylib 0x00007fff8fe9847f _dispatch_queue_drain + 235
8 libdispatch.dylib 0x00007fff8fe982f1 _dispatch_queue_invoke + 52
9 libdispatch.dylib 0x00007fff8fe981c3 _dispatch_worker_thread2 + 249
10 libsystem_c.dylib 0x00007fff95f64d0b _pthread_wqthread + 404
11 libsystem_c.dylib 0x00007fff95f4f1d1 start_wqthread + 13
)
libc++abi.dylib: terminate called throwing an exception
and
2013-08-01 21:52:15.964 Zipper[1616:1813] An uncaught exception was raised
2013-08-01 21:52:15.965 Zipper[1616:1813] *** -[__NSArrayM insertObject:atIndex:]: index 132 beyond bounds [0 .. 130]
2013-08-01 21:52:15.966 Zipper[1616:1813] (
0 CoreFoundation 0x00007fff94017b06 __exceptionPreprocess + 198
1 libobjc.A.dylib 0x00007fff99d043f0 objc_exception_throw + 43
2 CoreFoundation 0x00007fff93fc827a -[__NSArrayM insertObject:atIndex:] + 282
3 Zipper 0x000000010000f902 __21-[JOxxx jo_parse]_block_invoke + 690
4 libdispatch.dylib 0x00007fff8fe9af01 _dispatch_call_block_and_release + 15
5 libdispatch.dylib 0x00007fff8fe970b6 _dispatch_client_callout + 8
6 libdispatch.dylib 0x00007fff8fe9847f _dispatch_queue_drain + 235
7 libdispatch.dylib 0x00007fff8fe982f1 _dispatch_queue_invoke + 52
8 libdispatch.dylib 0x00007fff8fe981c3 _dispatch_worker_thread2 + 249
9 libsystem_c.dylib 0x00007fff95f64d0b _pthread_wqthread + 404
10 libsystem_c.dylib 0x00007fff95f4f1d1 start_wqthread + 13
)
Two queues were accessing the array at the same time.