Unexpected crash while setting chart view

I am facing this weird issue suddenly.
I am using V3.3.0 via carthage but my main project is still using Swift 4.2
So the issue is my app crashes upon this line

`let dataEntry = BarChartDataEntry(x: Double(i), y: Double(forY[i]), data: self.daysName as AnyObject?)`

And there is just one error message on console `Message from debugger: Terminated due to signal 9` and that's so weird, I cant find out actual reason of crash.
Sometimes it does work but most of the time it crashes.

I have also checked about the types of the values and all are correct.
Still I cant find out why its crashing.

Am I missing something?
Please help.
Thanks