Using sourcetext from another layer as an array - blowing up expression

Hey all, I am doing something that I assumed would be a quick and easy, and it is turning into quite a headache.
Here is what I am trying... (The following works btw)
stuff = thisComp.layer("textSource").text.sourceText;
stuff[2]
The problem is that if I try an index higher than 3, the expression blows up. The error is somewhat odd too...
property or method named '4' in Class 'TextProperty' is missing or does not exist. It may have been renamed, moved, deleted...
The source layer has not gone anywhere. The only thing that changes was the index.
I want to break down the sourceText into individual letters to feed something else and this was how I was going to go about it as I don't think the you can 'split' into letters. I figured I could get the length of the string and then scoop out each letter. Not so much eh'?
Update...
Tried it with split, and this also breaks it. What's odd is it seems to work for just a moment, so the script takes the index, displays the letter, waits a second, then freaks out. It does the work/breaking thing as long as the string has contains enough characters, as where a request for something that is not there immediately breaks it (which we would expect)
stuff = thisComp.layer("This").text.sourceText.split("");
stuff[15]

Hey Dan,
First, thanks for your reply. I found my error. My source text is keyframed. I found a long lost keyframe with 4 letters in it which was causing problems for everything else. I had checked through them several times. My eyes have gone goofy I suppose, because it was right there, clear as day. Any idea of how many iterations I tried to make something that already worked, work. Grrrr. It's usually the little things that get ya, eh'?

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