Thanks Dan,
It turns out that this wasn't the actual problem. I was getting a javascript error that made it seem like setColorAt was getting a null object. It turned out that I was hitting an object limit. Once I simplified some of my classes to maintain a spritesheet rather than a number of arrays of GreenfootImage, it eliminated the problem.
This is the scenario I'm working on, if you're interested: https://www.greenfoot.org/scenarios/25314
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2020/2/24
TestingColorAt