title: App Rejected - Crashes on Launch unable to replicate
body: <p>I have an app that works well when I test on device, however after submitting to Apple for review, I was told the app crashes at launch. 
  Further investigation of the symbolicated crash log showed that there was something wrong with below function (<strong>line 131: self.highScore = leaderboardRequest.localPlayerScore.value</strong>)</p>
  
  <p>Anyone see this before? I'm thinking it has something to do with 64bit architecture but I can't replicate the error.  </p>
  
  <pre><code>func getHighScore(leaderBoardId: String) {
  
      let localPlayerID = GKLocalPlayer.localPlayer().playerID
  
      let leaderboardRequest = GKLeaderboard(playerIDs: [localPlayerID]) as GKLeaderboard!
      leaderboardRequest.identifier = leaderBoardId
      if leaderboardRequest != nil
      {
          leaderboardRequest.loadScoresWithCompletionHandler({ (scores:[AnyObject]!, error:NSError!) -&gt; Void in
              if error != nil
              {
                  //handle error
                  log.debug("error retrieving score")
              }
              else
              {
                  log.debug("here we go: \(leaderboardRequest.localPlayerScore.value)")
                  self.highScore = leaderboardRequest.localPlayerScore.value //line 131
                  NSNotificationCenter.defaultCenter().postNotificationName(AUTHENTICATED_NOTIFICATION, object: self)
              }
          })
      }
  }
  </code></pre>
  
  <p>Crash Logs are below:</p>
  
  <pre><code>{"app_name":"MyGameApp","app_version":"1.1","bundleID":"com.aaapps.MyGameApp","adam_id":933686335,"os_version":"iPhone OS 8.1.1 (12B435)","slice_uuid":"00f078c2-cb60-3dec-b4d5-27187cb55a13","share_with_app_devs":false,"build_version":"1","is_first_party":false,"bug_type":"109","name":"MyGameApp"}
  Incident Identifier: 5010EF12-A30A-41E2-9FEA-2335C25EB3DC
  CrashReporter Key:   e3d10d2ccd5af0e83a5e75453e737ab344eca9e4
  Hardware Model:      xxx
  Process:             MyGameApp [2917]
  Path:                /private/var/mobile/Containers/Bundle/Application/D3BD0802-4F20-4C10-AC6A-E0EACECFEE44/MyGameApp.app/MyGameApp
  Identifier:          com.aaapps.MyGameApp
  Version:             1 (1.1)
  Code Type:           ARM-64 (Native)
  Parent Process:      launchd [1]
  
  Date/Time:           2014-12-01 09:56:07.167 -0800
  Launch Time:         2014-12-01 09:56:01.608 -0800
  OS Version:          iOS 8.1.1 (12B435)
  Report Version:      105
  
  Exception Type:  EXC_BREAKPOINT (SIGTRAP)
  Exception Codes: 0x0000000000000001, 0x00000001002682e0
  Triggered by Thread:  0
  
  Thread 0 name:  Dispatch queue: com.apple.main-thread
  Thread 0 Crashed:
  0   libswiftCore.dylib              0x00000001002682e0 _TFSs18_fatalErrorMessageFTVSs12StaticStringS_S_Su_T_ + 144
  1   libswiftCore.dylib              0x00000001002682dc _TFSs18_fatalErrorMessageFTVSs12StaticStringS_S_Su_T_ + 140
  **2   MyGameApp                             0x00000001000f8c48 MyGameApp.GameKitHelper.(getHighScore (MyGameApp.GameKitHelper) -&gt; (Swift.String) -&gt; ()).(closure #1) (GameKitHelper.swift:131)**
  3   MyGameApp                           0x00000001000f9060 reabstraction thunk helper from @callee_owned (@owned [Swift.AnyObject]!, @owned ObjectiveC.NSError!) -&gt; (@unowned ()) to @callee_owned (@in ([Swift.AnyObject]!, ObjectiveC.NSError!)) -&gt; (@out ()) (GameKitHelper.swift:123)
  4   MyGameApp                           0x00000001000f3188 partial apply forwarder for reabstraction thunk helper from @callee_owned (@owned [Swift.AnyObject]!, @owned ObjectiveC.NSError!) -&gt; (@unowned ()) to @callee_owned (@in ([Swift.AnyObject]!, ObjectiveC.NSError!)) -&gt; (@out ()) (GameKitHelper.swift:0)
  5   MyGameApp                           0x00000001000f9088 reabstraction thunk helper from @callee_owned (@in ([Swift.AnyObject]!, ObjectiveC.NSError!)) -&gt; (@out ()) to @callee_owned (@owned [Swift.AnyObject]!, @owned ObjectiveC.NSError!) -&gt; (@unowned ()) (GameKitHelper.swift:0)
  6   MyGameApp                           0x00000001000f91f8 reabstraction thunk helper from @callee_owned (@owned [Swift.AnyObject]!, @owned ObjectiveC.NSError!) -&gt; (@unowned ()) to @callee_unowned @objc_block (@unowned ObjectiveC.NSArray!, @unowned ObjectiveC.NSError!) -&gt; (@unowned ()) (GameKitHelper.swift:123)
  7   GameCenterFoundation            0x000000018d45e3c0 __39-[GKDispatchGroup 
  </code></pre>