Crashlog: https://pastebin.com/8n7fhjsf

If you need any other informations, let me know.

Ok, after digging around, it seems like this problem could be related to #898

Changing

S:"Mutation Chance"=0.2

to

S:"Mutation Chance"=1.0

its producing the crash thats the problem.
I havent tested any other values but if the value is on 0.2 everything is working fine.

This was due to an edge case on the value 1.0, which the config allows, but the mutation engine would not accept. This has been fixed now for the latest alpha.