ios - EXC_BAD_ACCESS when swizzle popViewControllerAnimated: -

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for logging navigation between controllers, use swizzling of -popviewcontrollersanimated: method. , causes strange crash exc_bad_access. can reason?

- (void)sw_popviewcontrolleranimated:(bool)animated {  //1. top controller before pop //2. pop //3. top controller after pop //4. log nsstring *controllerfromidentifier = @""; __block nsstring *controllertoidentifier = @"";      nsdictionary *controllerfromadditionalparams = @{};      uiviewcontroller *topcontroller = ((uinavigationcontroller*)self).topviewcontroller;      [self sw_popviewcontrolleranimated:animated];      uiviewcontroller *topcontrollerafterpop = ((uinavigationcontroller*)self).topviewcontroller;  }


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