app.textFonts[i] references not working in AI 2017 Update (Javascript)

Just updated Illustrator (21 October 2017), and now all attempt to reference the list app.textFonts[i] (in Javascript) fail and show the following error:

Error 1200: an Illustrator error occurred: 1430996551 ('GFKU')

I have several scripts that reference app.textFonts or just textFonts

I even tested on the default script that the Javascript Illustrator Scripting Guide gives:

app.textFonts.length still works and outputs the proper number of fonts I have installed.

but any attempt to reference an index fails.

For example the following will throw the error:

var sTextFontName = app.textFonts[i].name

But this will not throw the error:

var nNumberOfTextFonts = app.textFonts.length

Update: .getByName does not work either.  I can use a direct reference such as app.textFonts[642] or app.textFonts[112].name for instance, which both work.  But trying to put a variable in there kills it.  Even if I type case it using parseInt.

OS: OS X

Version: 10.13

Illustrator Version: 22.0.0