Possible bug report

Yep the problem is deeper. It looks like, if i had no battles before everything is fine (not 100% sure). Then, if i restart the test run this Exception comes up. I run it with 20 seasons (melee).

I made just a quick fix for me, so i can still use it. The only thing i lost was the 'Overall' score output - but i'm fine with the 'Average' output.

I have forked your repository and made a new brunch from the main branch, not sure if you can see it on your side to. The only thing i changed so far is the output of the melee score (just formatting). Yes, i guess i will use it mainly as new project and tweak it to my needs, but i thought for little bug fixes it would be easier to just merge the branches.