Ah, thank you for the details! I've been able to reproduce with these steps, and fixed.
Turns out I didn't account for the possibility of right-clicking directly into another robot's info
while those new subwindows were open.
(That said, although it doesn't crash anymore, for some odd reason when you do this series of steps the game won't let you then right-click through a
third robot's info without first closing the window. I can't solve that one right now since I have to do the release ASAP, so that's a different bug I'll be looking into for the next update! But at least it's easily reproducible so I'll take care of it quickly enough
)