Crashing on [self.graph reset] calling

[BadriVK]

I have to draw day, week, month and year graph in segmented view and when I try to change the segment tab just need to reset the graph lines and redraw graph but when I call [self.graph reset] in viewwillappear and call [self.graph draw] its crashing the app in _removeTitleLabels method.

• (void)_removeTitleLabels {

  if (self.titleLabels.count > 0) {
  [self.titleLabels mk_each:^(id item) {
  [item removeFromSuperview];
  }];
  }
  self.titleLabels = nil;
  }
  -[_UILabelLayer convertPoint:fromLayer:]: message sent to deallocated instance
  Please help
  I'm using https://github.com/ermalkaleci/CarbonKit for plot graph for, today, week, month and year, when switch between the tabs I call draw method everytime but it still crash at some points