Encountered this error with a micro harpa in power armor. Got a screenshot this time before it disappeared, was in __Misanthrope__/libs/harpa.lua:335. Using the same save and mods as the previous report (though I took it off of drive, if I need to repost it I can do so).

I also had this happen with a regular harpa earlier in the game, but hadn't been able to reproduce or remember the error specifically.

I got this error with the normal HARPA as well. No idea of the cause.

@Liquid5n0w
I've brought it to Afforess' attention and it should have been fixed in 0.63

Apparently I'm still on 6.2 even though I have been updating the mods every time I run the game. Just tried again and it's not picked up in the updates.