Arr_plugin.js error

I keep getting this error seemingly at random and can't figure out for the life of me how to isolate it to make a bug report, so I was hoping someone could shed some light on the nature of the error.

https://drive.google.com/file/d/1TdTAz8zHqaRyJuvcVss6nfQU15SSjWSP/view?usp=sharing

I finally figured it out. It was I was trying to call a value from a spot on an array that didn't exist.

Please file such issues to the Bugs forum following all the guidelines.

I tried replicating it in a bare-bones CAPX, but it won't do it now for some reason.