Index out of range Error when Text is empty before the new text will be added.

[Skyb0rg]

I got this Error:
Thread 1: Fatal error: Index out of range
Here:

func limboOfNewCharacter(
        _ char: Character,
        index: Int,
        progress: Float) -> LTCharacterLimbo {
            
            let currentRect = newRects[index] <---- here i got : Thread 1: Fatal error: Index out of range
            var currentFontSize = CGFloat(
                LTEasing.easeOutQuint(progress, 0, Float(font.pointSize))

the textlabel was empty (view did load) before i added new text later.