iOS 8 SpriteKit crashes on adding or removing a child from block/action

Question

As of iOS8 my game started to crash all of a sudden. After a bit of debugging I have found that the game crashes in the two following places :

 [sparkNode runAct         


        

Answer 1

I faced with a problem in enumerate in iOs8:

[supers enumerateChildNodesWithName:@"super3" usingBlock:^(SKNode *node, BOOL *stop) {
 ....
            [supers addChild:super3counter]; //crash here
}]; 

dispatch_async helped too.

And note all: crash not occured immidiatly - it takes about 0.5 sec, and code befro and after can be even executed.