Internal Error Code 1682591070:3123+27 attempt to index a nil value

Hi, I recently started using CH 2020 as well as Illustrator 2020 and have been working on a puppet with 6 legs. Thing is, when I added the 6 legs, CH gave me an internal error code and suggested I attempt to index a nil value. I'm not familiar with nil values and where to even look so I tried reducing the leg count to just 2 (one on each side of the puppet)... same issue. Any help would be appreciated!