title: Sprite Kit App Crash on SKCAction::wasRemovedFromTarget
body: <p>I have tested my app thoroughly on my device with no crashes, the game runs great. However, on my friends device and a few others, it is crashing at the same point. After running the app on my friends device I get this exception: EXC_BAD_ACCESS, with no error message in the console. And my call stack is the screenshot I attached below:</p>
  
  <p>Why is this happening on one device, but not others? Perhaps it's because of different iOS versions but I would like to solve this.</p>
  
  <p><img src="https://i.stack.imgur.com/vgsbI.png" alt="enter image description here"></p>
  
  <p>Also, here is the code I am running:</p>
  
  <p>I create an SKAction to resuse. This action shoots razors across the screen for you to dodge it. It always seems to crash either 2-3 razors in..</p>
  
  <p>SKAction Creation:</p>
  
  <pre><code> CGFloat distanceToMoveArrow = self.frame.size.width + (_razorTexture.size.width*4);
  SKAction* moveArrow = [SKAction moveByX:-distanceToMoveArrow y:0 duration:0.001 * distanceToMoveArrow];
  SKAction* removeArrow = [SKAction removeFromParent];
  _moveAndRemoveArrow = [SKAction sequence:@[moveArrow, removeArrow]];
  </code></pre>
  
  <p>Shooting the Razors:</p>
  
  <pre><code> NSLog(@"Arrow Shot");
  
  SKNode* razorGroup = [SKNode node];
  razorGroup.position = CGPointMake( self.frame.size.width + _razorTexture.size.width, 0 );
  
  SKSpriteNode* razor = [SKSpriteNode spriteNodeWithTexture:_razorTexture];
  razor.position = CGPointMake( 0, _bird.position.y);
  razor.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:_razorTexture.size.width/2];
  razor.physicsBody.dynamic = NO;
  razor.physicsBody.categoryBitMask = wallCategory;
  razor.physicsBody.contactTestBitMask = birdCategory;
  [razorGroup addChild:razor];
  
  [razorGroup runAction:_moveAndRemoveArrow];
  [_obstacles addChild:razorGroup];
  
  [self runAction:[SKAction playSoundFileNamed:@"razor-sound.wav" waitForCompletion:NO] withKey:@"RazorSound"];
  </code></pre>
  
  <p>FYI - This seems to only be happening on iOS 7</p>