JavaScript error when re-defining leds

[uPaymeiFixit]

The following code re-defines the leds 2d array, yet does not throw any errors, and does not let the program recover by switching to another pattern.

leds[0] = 0

This is because we have redefined this led[0] array. I suspect it will also not work if we do leds = null or something.

A possible fix for this is either re-instantiating the leds every time we load a new pattern, or check every update if every element of the 2d array is still in tact.