Games crashes, X-code Debug Error

[Shmuper]

Wow my game has never crashed this much. lolz. Here's what I got while running testing the app (BTW just reverted to Beta 3...)

AudioStreamBasicDescription: 2 ch, 44100 Hz, 'lpcm' (0x00000C2C) 8.24-bit little-endian signed integer, deinterleaved
2012-04-12 22:45:31.666 Keshigomu[139:707] authenticateWithCompletionHandler: enter
2012-04-12 22:45:31.709 Keshigomu[139:707] authenticateWithCompletionHandler: exit
2012-04-12 22:45:31.879 Keshigomu[139:707] authenticateWithCompletionHandler: enter
2012-04-12 22:45:53.300 Keshigomu[139:707] *** Terminating app due to uncaught exception 'NSRangeException', reason: '-[__NSCFConstantString characterAtIndex:]: Range or index out of bounds'
*** First throw call stack:
(0x3549e88f 0x368c5259 0x3549e789 0x3549e7ab 0x3540bfed 0x11df05 0xc951d 0xc8cef 0x42415 0x74f15 0x249e3 0x23f51 0x23c1f 0xec6b7 0xdffc1 0x9e5f 0x8ad5 0x3593 0x3135560d 0x35472a33 0x35472699 0x3547126f 0x353f44a5 0x353f436d 0x366f0439 0x324eae7d 0x2123 0x20dc)
terminate called throwing an exception(lldb)

[Francois]

Have you added new sounds recently? It looks like a crash in the sound routines.
What do you make to have it crash?N Do you think it is related to a specific sound?