On my mac OSX snow leopard and xcode 4.1 and the last SDK, My application crash on my phone but on my phone friend it don't crash.

I've got this error, I launch my application, wait RSS feed and after 2/3 seconds it crashed : Thank you for your help....

Date/Time:       2011-10-07 10:15:54.675 +0200
OS Version:      iPhone OS 4.3.3 (8J2)
Report Version:  104

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x2040b743
Crashed Thread:  6

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0:
0   libsystem_kernel.dylib          0x332a5c00 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x332a5758 mach_msg + 44
2   CoreFoundation                  0x329382b8 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x3293a562 __CFRunLoopRun + 350
4   CoreFoundation                  0x328caebc CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x328cadc4 CFRunLoopRunInMode + 52
6   GraphicsServices                0x33433418 GSEventRunModal + 108
7   GraphicsServices                0x334334c4 GSEventRun + 56
8   UIKit                           0x32417d62 -[UIApplication _run] + 398
9   UIKit                           0x32415800 UIApplicationMain + 664

Thread 1:
0   libsystem_kernel.dylib          0x332a83ec __workq_kernreturn + 8
1   libsystem_c.dylib               0x32c966d8 _pthread_wqthread + 592
2   libsystem_c.dylib               0x32c96bbc start_wqthread + 0

Thread 2 name:  Dispatch queue: com.apple.libdispatch-manager
Thread 2:
0   libsystem_kernel.dylib          0x332a8fbc kevent + 24
1   libdispatch.dylib               0x30205032 _dispatch_mgr_invoke + 706
2   libdispatch.dylib               0x3020603a _dispatch_queue_invoke + 86
3   libdispatch.dylib               0x302055ea _dispatch_worker_thread2 + 186
4   libsystem_c.dylib               0x32c9658a _pthread_wqthread + 258
5   libsystem_c.dylib               0x32c96bbc start_wqthread + 0

Thread 3:
0   libsy
objective-c ios xcode exc-bad-access
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