It is not working for me. Please, have a look to log:
2013-11-19 12:21:12.479 tag[13340:507] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff910c841c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff96734e75 objc_exception_throw + 43
2 CoreFoundation 0x00007fff90f898b7 -[__NSArrayM insertObject:atIndex:] + 951
3 tag 0x00000001075b209c tag + 4252
4 tag 0x00000001075b4195 tag + 12693
5 libdyld.dylib 0x00007fff909f55fd start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException