Game crash + save wiped out after adding a minimum release fee

It seems that after editing a save file by adding a minimum release clause to a player game crashes itself.
The error appears during saving the game, after the modification occurred.
I would attach a DMP, but the file is too large, so here's a link:
https://send.vis.ee/download/1666ad628e5a75a0/#Todw3ykO9T7YFR6em2jQ6Q

I was able to pinpoint the issue.
I'll roll out a fix tonight, and introduce a couple of UI features as well.