-[MyDictationController respondsToSelector:] message sent ot deallocated instance

Question

My app crashes with this stack trace:

[DictationDetailsController respondsToSelector:]: message sent to deallocated instance

I tracked that on instruments trying to see the relevant code causing the crash:

here is the relevant code for MyDictationController in the didSelectRowAtIndexPath: delegate method:

- (void)tableView:(UITableView )tableView didSelectRowAtIndexPath:(NSIndexPath )indexPath {
        DictationDetailsController *controller = GET_CONTROLLER_WITH_CLASS([DictationDetailsController class]);
        controller.dictation = [unSubmittedDictations objectAtIndex:indexPath.row];
        controller.isEditMode = YES;
        controller.selectedDate = _selectedDate;
        controller.hidesBottomBarWhenPushed = YES;
        [self.navigationController pushViewController:controller animated:YES];
}

@property (copy ,nonatomic) Dictation *dictation;

Also i have used @synthesize. Help me out in this issue, to get which deallocated method is being called.?

Here's my DictationDetailsController interface:

@interface DictationDetailsController : BaseController

@property (copy ,nonatomic) Dictation *dictation;
@property (nonatomic) BOOL isEditMode;
@property (nonatomic) NSDate *selectedDate;

@property (weak, nonatomic) IBOutlet UILabel *navigationTitleLabel;
@property (weak, nonatomic) IBOutlet UITextField *patientNameTextField;
@property (weak, nonatomic) IBOutlet UITextField *accountIDTextField;
@property (weak, nonatomic) IBOutlet UITextField *workTypeTextField;
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *deleteButtonWidth;
@property (weak, nonatomic) IBOutlet UIView *tutorialView;
@property (weak, nonatomic) IBOutlet UIView *audioContainer;
@property (weak, nonatomic) IBOutlet UISlider *audioSlider;
@property (weak, nonatomic) IBOutlet UILabel *durationLabel;
@property (weak, nonatomic) IBOutlet UILabel *noRecordingLabel;
@property (weak, nonatomic) IBOutlet UIButton *playPauseButton;

@end

And in dealloc method:

- (void)dealloc {
    [player pause];
    player = nil;
    self.dictation = nil;
}

Answer 1

My guess is the issue is somewhere inside GET_CONTROLLER_WITH_CLASS method. Pop a breakpoint on that line and step over it. It's possibly producing a released instance of the class. That being the case, the crash would occur on the line immediately following the call to that method when it tries to access the dictation property.