some time result in crash

[cjckkk]

add method:
void(^animation3)(void) = ^{
[UIView AR_springAnimationWithDuration:0.8 animations:^{
self.loginbtn.layer.scale = 2;
self.loginbtn2.layer.scale = 1;
self.loginbtn.layer.position = CGPointMake(CGRectGetMidX(self.view.bounds), ScreenHeight/2);
self.loginbtn2.layer.position = CGPointMake(CGRectGetMidX(self.view.bounds), ScreenHeight/2);
} completion:nil];

};
void(^animation2)(void) = ^{
    [UIView AR_springAnimationWithDuration:1.1 animations:^{
        self.loginbtn.layer.cornerRadius = CGRectGetMidX(self.loginbtn.bounds);
        self.loginbtn2.layer.cornerRadius = CGRectGetMidX(self.loginbtn2.bounds);
        static dispatch_once_t onceToken;

        dispatch_once(&onceToken, ^{
            self.loginbtn2.layer.rotation = M_PI*2;
            self.loginbtn.layer.rotation = -M_PI*2;
                       });

    } completion:animation3];
};

void(^animation1)(void) = ^{
    [UIView AR_animationWithDuration:0.5 animations:^{
        self.loginbtn.layer.position = CGPointMake(CGRectGetMidX(self.view.bounds), 150);
        self.loginbtn2.layer.position = CGPointMake(CGRectGetMidX(self.view.bounds), 150);
        self.loginbtn.layer.scaleX = 1.3;
        self.loginbtn2.layer.scaleY = 1.3;
    } completion:animation2];
};


[UIView AR_animationWithDuration:0.1 animations:^{
    self.loginbtn.backgroundColor = NavgationBarColor;
    self.loginbtn2.backgroundColor = [self randomColor];
    self.loginbtn2.alpha = 1;
} completion:animation1];

some time result in crash

[AugustRush]

some detail for me? the stack information?