title: SpriteKit crash on [self removeAllActions];
body: <p>Just moved into the open iOS 9 Beta (version 3) and my app is now crashing on this line:</p>
  
  <pre><code>[self removeAllActions]; // where "self" is an SKNode
  </code></pre>
  
  <p>Edit: After digging a little further I found the problem occurs when removeAllActions is inside a completion handler:</p>
  
  <pre><code>[self runAction: someSKAction completion:^{
      [self removeAllActions]; // this will cause the crash
  }];
  </code></pre>
  
  <p>The error in the console states: </p>
  
  <pre><code>libc++abi.dylib: terminating with uncaught exception of type std::out_of_range: vector
  </code></pre>
  
  <p>Is anyone else having this sort of problem?</p>
  
  <p>Edit: I was not having this problem with any versions of iOS7 or iOS8. I submitted a bug report to Apple, report #21788047</p>