Script execution error using 'the fontNames'

[Paul Dupuis]

With the assorted list problems, I hope this get posted in a readable form.

On Windows 19, in a Standalone built on Livecode 9.6.3, the following line:

put the fontNames into tFonts

Is generating the following execution error:
put: error in expression:  (Line 5789, column 1)

This code works - on Windows, on macOS - and has for quite some time. 
This has to be something specific about the person's Windows install 
that is causing it and I wonder if anyone on the list has ever run into 
this before and has some clue as to WHAT (on this specific Windows 
system may cause this)?

Thank you in advance,