Crashing when reutilizing

[mnievas]

Version: 3.0.13
File: JBLineChartDotsView.m
When animating a second line (at least).

In line of 74, this code returns a NSNull object.
__block UIView *dotView = [mutableReusableDotViews jb_pop];

Then in this line (76), it crashes because NSNull does not have a .center, obviously :)

dotView.center = CGPointMake(lineChartPoint.position.x, lineChartPoint.position.y); // animate move

Thanks in advance.
Marce.