It crashes when AVAssetReader is released

Thread 5 Crashed:
0   libobjc.A.dylib               	       0x19af7b038 objc_msgSend + 56
1   CoreFoundation                	       0x19dfdb618 cow_cleanup + 135
2   CoreFoundation                	       0x19dfdb6fc -[__NSDictionaryM dealloc] + 147
3   MediaToolbox                  	       0x1b167636c FigRemotePropertyCacheTeardown + 31
4   MediaToolbox                  	       0x1b1c5b648 remoteXPCAsset_Finalize + 107
5   CoreMedia                     	       0x1b1e9166c FigBaseObjectFinalize + 275
6   CoreFoundation                	       0x19dfcc5ec _CFRelease + 295
7   AVFCore                       	       0x1b1054d64 -[AVFigAssetTrackInspector dealloc] + 151
8   AVFCore                       	       0x1b0f818d8 -[AVAssetTrack dealloc] + 63
9   CoreFoundation                	       0x19dfdba28 __RELEASE_OBJECTS_IN_THE_ARRAY__ + 115
10  CoreFoundation                	       0x19dfdb7e0 -[__NSArrayM dealloc] + 147
11  AVFCore                       	       0x1b0f52e04 -[AVURLAsset dealloc] + 167
12  libobjc.A.dylib               	       0x19af821f8 object_cxxDestructFromClass(objc_object*, objc_class*) + 115
13  libobjc.A.dylib               	       0x19af7df20 objc_destructInstance_nonnull_realized(objc_object*) + 75
14  libobjc.A.dylib               	       0x19af7d4a4 _objc_rootDealloc + 71
15  AVFCore                       	       0x1b0fef988 -[AVAssetReaderOutput dealloc] + 415
16  AVFCore                       	       0x1b0ff11ec -[AVAssetReaderTrackOutput dealloc] + 127
17  CoreFoundation                	       0x19dfe20a4 -[__NSSingleObjectArrayI dealloc] + 63
18  libobjc.A.dylib               	       0x19af7d3f8 AutoreleasePoolPage::releaseUntil(objc_object**) + 203
19  libobjc.A.dylib               	       0x19af7d284 objc_autoreleasePoolPop + 243
20  CoreFoundation                	       0x19dfccae8 _CFAutoreleasePoolPop + 31
21  Foundation                    	       0x19b676778 -[NSAutoreleasePool drain] + 135