my code snippet:

```
- (void)viewDidUnload{
    [super viewDidUnload];
    self.statusView = nil;
    self.tableView = nil;
    self.noDataView = nil;
}

```

In a rare situation, my app crashed in line `self.noDataView = nil;`. When I debug by `po self`, it seemed that it's pointing something other than current controller. What is possible reason? 

PS:`self.tableView`'s `delegate` and `dataSource` is set to `self` in `init` method. Does that have any relation to this?