title: iOS 9 Parse (v 1.8.5) Facebook (v 4.6) login crash on FBSDKInternalUtility checkRegisteredCanOpenURLScheme
body: <p>I am doing simple login with facebook using parse for iOS 9 using Swift 2. 
  I use ParseFacebookUtilsV4.framework from parse. </p>
  
  <p>I have exactly followed instruction for iOS 9 from this link. </p>
  
  <p><a href="https://developers.facebook.com/docs/ios/ios9">https://developers.facebook.com/docs/ios/ios9</a></p>
  
  <p>Also, I am using Parse (v 1.8.5) Facebook (v 4.6). However, when I try to login like this,</p>
  
  <pre><code>    let permissions = ["user_about_me", "user_relationships", "user_birthday", "user_location"]
  
      PFFacebookUtils.logInInBackgroundWithReadPermissions(permissions, block: { (user: PFUser?, error: NSError?) -&gt; Void in //switched ! to ?
          if user == nil {
              NSLog("Uh oh. The user cancelled the Facebook login.") }
          else if user!.isNew
          { //inserted !
              NSLog("User signed up and logged in through Facebook!")
          }
          else {
              NSLog("%@", error?.localizedDescription as String!)
              NSLog("User logged in through Facebook! \(user!.username)")
          } })
  </code></pre>
  
  <p>It crash like this. I also can't trace how and why it crash. How shall I solve? </p>
  
  <pre><code>+[FBSDKInternalUtility checkRegisteredCanOpenURLScheme:]:
  0x10014ec04 &lt;+0&gt;:   stp    x22, x21, [sp, #-48]!
  0x10014ec08 &lt;+4&gt;:   stp    x20, x19, [sp, #16]
  0x10014ec0c &lt;+8&gt;:   stp    x29, x30, [sp, #32]
  0x10014ec10 &lt;+12&gt;:  add    x29, sp, #32
  0x10014ec14 &lt;+16&gt;:  sub    sp, sp, #16
  0x10014ec18 &lt;+20&gt;:  mov    x20, x0
  0x10014ec1c &lt;+24&gt;:  mov    x0, x2
  0x10014ec20 &lt;+28&gt;:  bl     0x10020d6d0               ; symbol stub for: objc_retain
  0x10014ec24 &lt;+32&gt;:  mov    x19, x0
  0x10014ec28 &lt;+36&gt;:  adrp   x8, 341
  0x10014ec2c &lt;+40&gt;:  ldr    x8, [x8, #3320]
  0x10014ec30 &lt;+44&gt;:  cmn    x8, #1
  0x10014ec34 &lt;+48&gt;:  b.ne   0x10014eccc               ; &lt;+200&gt; [inlined] _dispatch_once at
  </code></pre>