iOS: Assertion failure on picker view

Q:
I'm getting an assertion failure while scrolling a picker view w/ zero data(zero rows). While scrolling the picker view I'm getting this crash. Testing on iOS 6

* Assertion failure in -[UITableViewRowData rectForRow:inSection:], /SourceCache/UIKit_Sim/UIKit-2372/UITableViewRowData.m:1630

* Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'request for rect at invalid index path ( 2 indexes [0, 0])'

A:
I've the same problem
I don't know reason why it is happen,
but it can be fixed in ios6 (how it works in ios5 I didn't check):

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    if ([self getCount] == )
        return ;
     return [self getCount];
}
 
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:   (NSInteger)component reusingView:(UIView *)view {
   if ([self getCount] == )
       return nil;
}