"using a generator that won't fail"

It seems your original function made the same assumption of V8's Math.random. All PRNGs fail at some point, even CSPRNGs. You may as well write your code accordingly, with less optimistic assumptions.

If you're not going to be adding layers of safety, and if you're going to keep insisting that your PRNG "won't fail" then I guess it's only a matter of time before you will have to repeat the same mistake.

As other commenters have pointed out, you should have written your function in such a way that it does not place a critical reliance on any single component.