Understanding crash report for Swift app in IOS

When I submitted my app to apple , I got back the following crash report. I didn't have any issues in test and the app has been running on multiple devices without issue. Any advice on this error

Last Exception Backtrace:
    Thread 0 name:  Dispatch queue: com.apple.main-thread
    Thread 0 Crashed:
    0   libsystem_kernel.dylib          0x00000001bcaeeef4 __pthread_kill + 8
    1   libsystem_pthread.dylib         0x00000001bca0fd1c pthread_kill + 196
    2   libsystem_c.dylib               0x00000001bc99fa54 abort + 104
    3   libc++abi.dylib                 0x00000001bcab63c8 __cxa_bad_cast + 0
    4   libc++abi.dylib                 0x00000001bcab65c0 demangling_unexpected_handler+ 5568 () + 0
    5   libobjc.A.dylib                 0x00000001bca1e3a8 _objc_terminate+ 25512 () + 124
    6   libc++abi.dylib                 0x00000001bcac3634 std::__terminate(void (*)+ 58932 ()) + 20
    7   libc++abi.dylib                 0x00000001bcac31ec __cxa_rethrow + 148
    8   libobjc.A.dylib                 0x00000001bca1e28c objc_exception_rethrow + 44
    9   CoreFoundation                  0x00000001bcc79108 CFRunLoopRunSpecific + 592
    10  GraphicsServices                0x00000001c6de3534 GSEventRunModal + 108
    11  UIKitCore                       0x00000001c0d997ac UIApplicationMain + 1940
    12  Racquet Life                    0x0000000100194730 main + 18224 (displayRightLabel.swift:25)
    13  libdyld.dylib                   0x00000001bcaf8f30 start + 4

    Thread 0 crashed with ARM Thread State (64-bit):
 Address size fault