LC -> Applescript -> Chrome

[jbv at souslelogo.com]

Hi list,

I have a stack that interacts with Chrome via Applescript.
It has been running fine for months.
Suddenly, one command line began to stall the whole process,
with the spinning wheel spinning forever.

And when I run the same Applescript in the script editor,
it still runs fine as before.
The line is :
tell application "System Events" to click at {x, y}
I am using LC 9.6.8

What should I look at to fix the issue ?
Thank you in advance.
jb