App rejected due to crash

Hi my app rejected due to crash, but i can't reproduce the crash from my side. Apples send following crash log:

    Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0:
0   libsystem_kernel.dylib          0x39146a50 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x39146849 mach_msg + 37
2   CoreFoundation                  0x2df99625 __CFRunLoopServiceMachPort + 153
3   CoreFoundation                  0x2df97d8b __CFRunLoopRun + 859
4   CoreFoundation                  0x2df02765 CFRunLoopRunSpecific + 521
5   CoreFoundation                  0x2df02547 CFRunLoopRunInMode + 103
6   GraphicsServices                0x32e396cf GSEventRunModal + 135
7   UIKit                           0x3086188d UIApplicationMain + 1133
8   tiein                           0x000df55f 0x7c000 + 406879
9   libdyld.dylib                   0x390a2ab5 start + 1

Thread 1 name:  Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0   libsystem_kernel.dylib          0x39146804 kevent64 + 24
1   libdispatch.dylib               0x39095051 _dispatch_mgr_invoke + 229
2   libdispatch.dylib               0x3908f2df _dispatch_mgr_thread + 35

Thread 2:
0   libsystem_kernel.dylib          0x39146a50 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x39146849 mach_msg + 37
2   CoreFoundation                  0x2df99625 __CFRunLoopServiceMachPort + 153
3   CoreFoundation                  0x2df97d45 __CFRunLoopRun + 789
4   CoreFoundation                  0x2df02765 CFRunLoopRunSpecific + 521
5   CoreFoundation                  0x2df02547 CFRunLoopRunInMode + 103
6   Foundation                      0x2e8f5493 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 251
7   Foundation                      0x2e946255 -[NSRunLoop(NSRunLoop) run] + 77
8   tiein                           0x00154241 0x7c000 + 885313
9   Foundation                      0x2e9b7a0b __NSThread__main__ + 1059
10  libsystem_pthread.dylib         0x391c0957 _pthread_body + 139
11  libsystem_pthread.dylib         0x391c08c7 _pthread_start + 99
12  libsystem_pthread.dylib         0x391beae4 thread_start + 4

Thread 3:
0   libsystem_kernel.dylib          0x39159c70 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x391bec1f _pthread_wqthread + 307
2   libsystem_pthread.dylib         0x391bead8 start_wqthread + 4

Thread 4:
0   libsystem_kernel.dylib          0x39159c70 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x391bec1f _pthread_wqthread + 307
2   libsystem_pthread.dylib         0x391bead8 start_wqthread + 4

Thread 5 name:  com.apple.NSURLConnectionLoader
Thread 5:
0   libsystem_kernel.dylib          0x39146a50 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x39146849 mach_msg + 37
2   CoreFoundation                  0x2df99625 __CFRunLoopServiceMachPort + 153
3   CoreFoundation                  0x2df97d45 __CFRunLoopRun + 789
4   CoreFoundation                  0x2df02765 CFRunLoopRunSpecific + 521
5   CoreFoundation                  0x2df02547 CFRunLoopRunInMode + 103
6   Foundation                      0x2e94223d +[NSURLConnection(Loader) _resourceLoadLoop:] + 317
7   Foundation                      0x2e9b7a0b __NSThread__main__ + 1059
8   libsystem_pthread.dylib         0x391c0957 _pthread_body + 139
9   libsystem_pthread.dylib         0x391c08c7 _pthread_start + 99
10  libsystem_pthread.dylib         0x391beae4 thread_start + 4

Thread 6 name:  com.apple.CFSocket.private
Thread 6:
0   libsystem_kernel.dylib          0x39159434 __select + 20
1   CoreFoundation                  0x2df9d51f __CFSocketManager + 483
2   libsystem_pthread.dylib         0x391c0957 _pthread_body + 139
3   libsystem_pthread.dylib         0x391c08c7 _pthread_start + 99
4   libsystem_pthread.dylib         0x391beae4 thread_start + 4

Thread 7 Crashed:
0   libsystem_kernel.dylib          0x391591f0 __pthread_kill + 8
1   libsystem_pthread.dylib         0x391c17b3 pthread_kill + 55
2   libsystem_c.dylib               0x39109ff5 abort + 73
3   libc++abi.dylib                 0x3855898b abort_message + 71
4   libc++abi.dylib                 0x385716e3 default_terminate_handler() + 251
5   libobjc.A.dylib                 0x38ba4f7b _objc_terminate() + 191
6   libc++abi.dylib                 0x3856f1b1 std::__terminate(void (*)()) + 77
7   libc++abi.dylib                 0x3856ea05 __cxa_throw + 113
8   libobjc.A.dylib                 0x38ba4db7 objc_exception_throw + 247
9   CoreFoundation                  0x2df0a1bb -[__NSDictionaryM setObject:forKey:] + 815
10  tiein                           0x000f7901 0x7c000 + 506113
11  tiein                           0x000eb7b3 0x7c000 + 456627
12  tiein                           0x00102c59 0x7c000 + 552025
13  Foundation                      0x2e9b7a0b __NSThread__main__ + 1059
14  libsystem_pthread.dylib         0x391c0957 _pthread_body + 139
15  libsystem_pthread.dylib         0x391c08c7 _pthread_start + 99
16  libsystem_pthread.dylib         0x391beae4 thread_start + 4

Thread 8:
0   libsystem_kernel.dylib          0x39159c70 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x391bec1f _pthread_wqthread + 307
2   libsystem_pthread.dylib         0x391bead8 start_wqthread + 4

Thread 7 crashed with ARM Thread State (32-bit):
    r0: 0x00000000    r1: 0x00000000      r2: 0x00000000      r3: 0x00002060
    r4: 0x00000006    r5: 0x02559000      r6: 0x00000000      r7: 0x02557f54
    r8: 0x14553fd0    r9: 0x00000001     r10: 0x146d7a80     r11: 0x146ebbb0
    ip: 0x00000148    sp: 0x02557f48      lr: 0x391c17b7      pc: 0x391591f0
  cpsr: 0x00000010

App crashes in login page, during login I am sending device token to server. If the token is nil it will crash(it might be a problem). But is any case arrives not getting the device token?