title: How to fix "This coder only encodes objects that adopt NSSecureCoding (object is of class '_SwiftValue')." crash from Crashlytics
body: <p>After last update of our app I had problem with crashing on exeption:</p>
  
  <pre><code>-[NSXPCEncoder _checkObject:]: This coder only encodes objects that adopt NSSecureCoding (object is of class '_SwiftValue').
  </code></pre>
  
  <p>I tried to remove library I add in this update, but it didn't help. The strange is, that its crashing only on iOS 12. We are supporting from iOS 9. I am not able to reproduce crash.</p>
  
  <pre><code>Crashlytic log:
  
  Fatal Exception: NSInvalidArgumentException
  *** -[NSXPCEncoder _checkObject:]: This coder only encodes objects that adopt NSSecureCoding (object is of class '_SwiftValue').
  
  Fatal Exception: NSInvalidArgumentException
  0  CoreFoundation                 0x22fea9ea4 __exceptionPreprocess
  1  libobjc.A.dylib                0x22f079a50 objc_exception_throw
  2  CoreFoundation                 0x22fdb0484 -[NSCache init]
  3  Foundation                     0x2308398a0 -[NSXPCEncoder _checkObject:]
  4  Foundation                     0x2308395e0 -[NSXPCEncoder _encodeUnkeyedObject:]
  5  Foundation                     0x23083a27c -[NSXPCEncoder _encodeArrayOfObjects:forKey:]
  6  Foundation                     0x230839b78 -[NSXPCEncoder _encodeObject:]
  7  Foundation                     0x23083a27c -[NSXPCEncoder _encodeArrayOfObjects:forKey:]
  8  Foundation                     0x230868ed8 -    [NSDictionary(NSDictionary) encodeWithCoder:]
  9  Foundation                     0x230839b78 -[NSXPCEncoder _encodeObject:]
  10 Foundation                     0x23083a27c -[NSXPCEncoder _encodeArrayOfObjects:forKey:]
  11 Foundation                     0x230839b78 -[NSXPCEncoder _encodeObject:]
  12 Foundation                     0x23083a27c -[NSXPCEncoder _encodeArrayOfObjects:forKey:]
  13 Foundation                     0x230868ed8 -[NSDictionary(NSDictionary) encodeWithCoder:]
  14 Foundation                     0x230839b78 -[NSXPCEncoder _encodeObject:]
  15 Foundation                     0x23083a27c -[NSXPCEncoder _encodeArrayOfObjects:forKey:]
  16 Foundation                     0x230868ed8 -[NSDictionary(NSDictionary) encodeWithCoder:]
  17 Foundation                     0x230839b78 -[NSXPCEncoder _encodeObject:]
  18 UserNotifications              0x23a3658cc -[UNNotificationContent encodeWithCoder:]
  19 Foundation                     0x230839b78 -[NSXPCEncoder _encodeObject:]
  20 UserNotifications              0x23a359578 -[UNNotificationRequest encodeWithCoder:]
  21 Foundation                     0x230839b78 -[NSXPCEncoder _encodeObject:]
  22 Foundation                     0x230a97ed8 _NSXPCSerializationAddInvocationWithOnlyObjectArgumentsArray
  23 Foundation                     0x2308369c0 -[NSXPCEncoder _encodeInvocationObjectArgumentsOnly:count:typeString:selector:isReply:into:]
  24 Foundation                     0x230836170 -[NSXPCConnection _sendInvocation:orArguments:count:methodSignature:selector:withProxy:]
  25 Foundation                     0x230865f3c -[NSXPCConnection _sendSelector:withProxy:arg1:arg2:arg3:]
  26 Foundation                     0x230a74ab8 _NSXPCDistantObjectSimpleMessageSend3
  27 UserNotifications              0x23a36dbf8 __104-[UNUserNotificationServiceConnection addNotificationRequest:forBundleIdentifier:withCompletionHandler:]_block_invoke
  28 libdispatch.dylib              0x22f8e16c8 _dispatch_call_block_and_release
  29 libdispatch.dylib              0x22f8e2484 _dispatch_client_callout
  30 libdispatch.dylib              0x22f889bd0 _dispatch_lane_serial_drain$VARIANT$mp
  31 libdispatch.dylib              0x22f88a74c _dispatch_lane_invoke$VARIANT$mp
  32 libdispatch.dylib              0x22f892eb8 _dispatch_workloop_worker_thread
  33 libsystem_pthread.dylib        0x22fac50dc _pthread_wqthread
  34 libsystem_pthread.dylib        0x22fac7cec start_wqthread
  </code></pre>