ios - exc-bad-access-code 错误

Question

当我执行代码时，出现以下错误。

下面是错误代码。

错误：thread-1-exc-bad-access-code-1-address-0x30000

@interface PhotoEffectsVC : UIViewController
{
    void (^controllerImage) (UIImageView *);

}

- (IBAction)saveButtonClicked:(id)sender {
    controllerImage(self.imgView);
}


// In the view where i want to access the image

-(void) viewWillAppear:(BOOL)animated
{
    UIStoryboard *aUIStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    PhotoEffectsVC *photoEffectVC= [aUIStoryboard instantiateViewControllerWithIdentifier:@"getPhotosVC"];
    [photoEffectVC setControllerImage:^(UIImageView *imageName)
     {
         [self.imgView setImage:imageName.image ];

     }];


}