ios8 - SpriteKit presentScene crash app -

i navigating between sk scenes using following code:

        skscene *newscene = [[myscene alloc] initwithsize:self.size state:state];          float duration = 1;          sktransition *transition = [sktransition fadewithduration:duration];          [self.view presentscene:newscene transition:transition]; 

regardless type of scene trying present, app crashes every time exc_bad_access (code 1) without zombies.. looks "present scene won't work correctly on xcode6, did work before upgraded xcode5

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edit: initwithsize code:

-(id)initwithsize:(cgsize)size state:(gamestate)state{     if (self = [super initwithsize:size]) {      [self setupscene];      if (state == gamestatelaunch) {          [self setuploadingscreen];          [self switchtolaunch];      } else if (state == gamestatetutorial || state == gamestatereplay) {          [self switchtotutorial];      } else if (state== gamestatemainmenu) {           [self switchtomainmenu];     }  }     return self; } 

i managed make work partially removing children before presenting new scene:

- (void)cleanupchildrenandremove {     (sknode *child in self.children) {         [child removefromparent];     }     [self removefromparent]; } 

however, crazy. there must better solution!