Title says it all.

https://pastebin.com/UqJjHZNr

Weird thing is, I can't reproduce it even with "dummy" mod. This is thread issue so it can be hard to reproduce to begin with, and I just had enough bad luck.

Please replicate with "dummmmmmy"/"mmmmmmmmmmmm" removed.

There'll be some code added to help try to protect against this in the future anyway.

Great, thanks. For now I will be playing without dummy mod. Can you give rough estimate when this modification will be implemented?

This is due to concurrent access to the same perk map; the player's key input runs on a GL spawned contextthread, so that might run into issues like this occasionally. this was already found in testing, fixed for next update.