Hi,
Since the recent migration i have trouble with Javascript when displaying a page in my application which use theme 42. The page doesn't display.
In fact, it seems to happen when i write some JS code in the page, code who worked fine so far. (juste changer color and size of item)
The error code is not always the same, sometimes it shows 'invalid number' or 'unexpected token'. This is an exemple :

This error does not happen everytime. If i refresh 5 times a working page, it can happen 2 or 3 times.
The problem here is the error code, who often change and sometimes i think that the JS code is damaged as some caracters disappears who cause the error (a comma missing).
I have an another app who run on Theme 25, i don't have the error.
I have no idea to fix the problem,
Thanks in advance.